CN102353405A - Steady-state circulation body for vortex shedding flowmeter - Google Patents

Abstract

The invention relates to a steady-state circulation body for a vortex shedding flowmeter, which structurally comprises a body, wherein a flow channel for the measured liquid to pass and two probe mounting holes which are communicated with the flow channel are arranged on the body, a vortex generating body is arranged in the flow channel, the body is a square body with paralleled top and bottom surfaces and paralleled side surfaces, and the flow channel is a square hole which penetrates through the body from the front and the back surfaces. The steady-state circulation body for the vortex shedding flowmeter overcomes the technical defects of unsteady observation and metering and slightly bigger integral structural size of the existing vortex shedding flowmeter, the size of a breaking-in pipeline can be correspondingly reduced during the installation process, the turbulent flow and the disturbance of the measured liquid can be reduced when the measured liquid passes through the flow channel of the circulation body, so the flow stablization effect is realized, and the stabilization of the vortex and the detection is realized.

Description

Vortex shedding flow meter steady state flow entire body

Technical field

The present invention relates to a kind of parts of vortex shedding flow meter, specifically a kind of vortex shedding flow meter steady state flow entire body.

Background technology

The plug-in type vortex shedding flow meter; Be to utilize " Karman vortex street " principle; Block the whirlpool that fluid media (medium) produces through detecting in the tested pipeline by vortex generation body fluoran stream surface, with the rate of flow of fluid of measuring the pipeline center position and then a kind of inductive flowmeter amount device that calculates the pipeline fluid flow.Its structure comprises gauge outfit, ultrasonic testing system, shank, several portions such as assembly and flow body are tightly connected; Wherein, flow body is to insert the part of carrying out flow rate detection in the tested pipeline through ball valve external on the tested pipeline.

Existing flow body comprises a conical body of being processed by double-deck cone socket; On the body of flow body, have a columnar runner and the relative probe mounting hole in two upper and lower positions that communicates with runner; In runner, be fixed with the cross section and be trapezoidal or leg-of-mutton prism, this prism is through detected fluid being carried out the part is blocked and is producing the vortex generation body of whirlpool thereafter.

The double-decker of flow body body be to be used for the lead that cross-under connects ultrasonic probe, and this double-deck main body structure is comparatively complicated, and production process is more, and processing cost is higher.In addition, for guaranteeing the due length of runner, make that the physical dimension of this conical body is bigger, thereby span is bigger; Flow body correspondingly,, also just needs enough big cross-under internal diameter, so that can pass smoothly and get in the tested pipeline for the ball valve of cross-under flow body.

More importantly, the existing flow of the flow path body are tapped cylindrical structure, and the bluff body is generally disposed within the flow channel in the middle position of the front port, so the setting position of the vortex shedder wide at the flow channel, and the upper and lower ends of the flow channel is narrow; due to this intermediate the upper and lower end of the large and small circular structural limitations, so that the rear of the vortex generated by the vortex, due to fluid in the upper and lower extrusion end stratification perturbation occurs, and this vortex is a direct consequence of stratification affect vortex detection of the ultrasonic probe, thereby causing the head of the table shows the jitter detection data unstable, i.e. the measured fluid the case of a stable flow, vortex flowmeter head of the table shows the figures also always changing, thus affecting the stability of vortex flowmeter vortex flowmeter measurement and on the stability of observation.This is the main cause that causes the vortex shedding flow meter performance unstable.

Summary of the invention

The object of the invention just provides a kind of vortex shedding flow meter steady state flow entire body, to solve metering and observation shakiness and the one-piece construction size problem bigger than normal that existing vortex shedding flow meter exists.

The present invention is achieved in that a kind of vortex shedding flow meter steady state flow entire body; Comprise body; On said body, have and supply the runner that detected fluid passes through and two probe mounting holes that communicate with said runner; In said runner, be provided with vortex generation body; Said body is that end face and bottom surface are parallel to each other, two square bodies that the side is parallel to each other, and said runner is for running through the square hole of body from the forward and backward surface of said body.

Flow body one of the present invention is that original circular flow channel is changed over square runner; Each that so just can improve greatly that fluid flows in runner is to consistance; Make the whirlpool that produced at vortex generation body rear portion can be along with runner in fluid smooth flow and move steadily; The extruding and the disturbance of fluid have been eliminated; Thereby also just can eliminate the up and down lamination of whirlpool in flow process; Help the stable detection of ultrasonic probe to whirlpool, can realize thus vortex shedding flow meter quantification stability, show stable and observation stable; The 2nd, owing to adopted square runner; Make flow area be able to effective increase; Under the precondition that guarantees identical flow area; The body construction size of flow body just can correspondingly reduce; And process with the corresponding square body structure of square runner after, the contour structure size of this body just can effectively reduce, and makes span reduce 20%; Can correspondingly reduce to be connected the internal diameter size of the ball valve on the tested pipeline thus, reduce the cost of installation and use of vortex shedding flow meter.

The front surface of said body is the outer convex surface of arc.The design of this arc fluoran stream surface; Changed the pressure blocking effect of flow body body to the runner external fluid; Reduce even avoided this pressure to stop adverse effect, reached the effect of current stabilization, help the raising of flow detection stability the perturbation that fluid brought that gets into runner; And the design of the outer convex surface of this arc under the condition that guarantees flow channel length, can further reduce the contour structure size of flow body body.

The rear surface of said body is the outer convex surface of arc.The design of this arc lee side also is under the condition that guarantees flow channel length, has further reduced the contour structure size of flow body body.

On the sidewall of said body, have the through wires hole that the cross-under lead is used, said through wires hole respectively with said body on two said probe mounting holes be connected, the upper and lower port of said through wires hole is opened end face and the bottom surface at said body respectively.So just can utilize common drilling machine and drill bit on the body of flow body, directly to process through wires hole, thereby simplify flow body main body structure and job operation, reduce the processing and the cost of manufacture of flow body.

Said vortex generation body is that the cross section is trapezoidal prism, and upper and lower two the drainage faces on the said prism are cancave cambered surface.Because upper and lower two the drainage faces on the vortex generation body are the generation face of whirlpool; Therefore; The drainage face structure of this arcs of recesses; More help the generation of complete eddy-currents; Also help the stably translational and the propelling of whirlpool; The drainage face structure that can avoid planar shaped thus is to the formation of whirlpool and to the smooth flow property adverse effect of whirlpool, thereby promoted the stable of whirlpool, improved the quantification stability of vortex shedding flow meter.

The present invention has overcome the observation of existing vortex shedding flow meter existence and metering is stable inadequately and one-piece construction size technological deficiency bigger than normal; Both can make corresponding the reducing of size of orcible entry pipeline in the installation process; Flow-disturbing and the disturbance of detected fluid when passing through the runner of flow body reduced; Reached steady flow result; Stablizing of whirlpool and stablizing of detection have been realized; Therefore, flow body of the present invention is a kind of steady state flow entire body that multinomial improvement effect is comprehensively arranged.

Description of drawings

Fig. 1 is a structural representation of the present invention.

Fig. 2 is the structural representation of vortex generation body.

Fig. 3 is a principle of work synoptic diagram of the present invention.

Each parts and numbering thereof are respectively among the figure: 1, body, 2, the probe mounting hole, 3, screw thread, 4, through wires hole, 5, vortex generation body, 6, runner, 7, ultrasonic transmitter, 8, ultrasonic receiver, 9, bottom.

Embodiment

In flow body shown in Figure 1, body 1 is the structure of the flat-square shaped shape of a stainless steel, and promptly the end face of body 1 and bottom surface are parallel to each other, and two sides are parallel to each other, and front and rear surfaces is the outer convex surface of arc.Outer convex surface is that central angle is 40 ~ 60 ° a upright arcwall face, and the string between the side of body 1 and the outer convex surface and the tangential angle of arc are greater than 130 °.

Certainly, body 1 also can be a version steel, the corresponding respectively cuboid parallel and that intersect vertically with its face of three groups of opposite faces.

Only on the body 1 of above-mentioned square body structure, just be fit to leave the runner of the maximum square or rectangular hole of area of passage, and guarantee that the contour structure size of body and span reach minimum.

Among Fig. 1, runner 6 is for running through the rectangle hole (also can be that the cross section is foursquare hole, but area of passage will reduce to some extent) of body from the forward and backward surface of body 1.2, two probes of the probe mounting hole mounting hole 2 that has the installation ultrasonic probe in the end face and the bottom surface of body 1 all communicates with runner 6, and the upper and lower position is relative.Ultrasonic probe comprises ultrasonic transmitter 7 and ultrasonic receiver 8.Ultrasonic transmitter 7 (Fig. 3) is installed in the probe mounting hole 2 on body 1 top, and getting on the bus at the hole wall of the probe mounting hole 2 on body 1 top is shaped on screw thread 3, in order to the shank that is threaded (pipe), and ultrasonic transmitter 7 is positioned.Ultrasonic receiver 8 (Fig. 3) is contained in the probe mounting hole 2 of body 1 bottom, and is located by bottom 9 sealing-ins.

On the sidewall of body 1, have a upright through wires hole 4 that connects body 1 downwards; The upper and lower end of this through wires hole 4 respectively with body 1 on upper and lower two the probe mounting holes 2 be connected; Pass body 1 with the lead that will connect ultrasonic probe; On the gauge outfit of linking vortex shedding flow meter on the shank, realize of the effective transmission of the ultrasonic reception electric signal of ultrasonic receiver 8 again to gauge outfit.

Vortex generation body 5 is fixed on the medium position in runner 6 front ports.That vortex generation body 5 can adopt is conventional, the cross section is trapezoidal or leg-of-mutton prism structure, but preferably adopts the distinctive project organization of the present invention.As shown in Figure 2, vortex generation body 5 of the present invention is that the cross section is trapezoidal prism structure, but upper and lower two the drainage faces on the prism are cancave cambered surface.The trapezoidal prism structure of this band cancave cambered surface had both helped the generation of complete whirlpool, also helped the translation and the propelling (as shown in Figure 3) of whirlpool, more help the stable detection of ultrasonic probe.

Claims (6)

1. vortex shedding flow meter steady state flow entire body; Comprise body (1); On said body (1), have and supply the runner (6) that detected fluid passes through and two probe mounting holes (2) that communicate with said runner (6); In said runner (6), be provided with vortex generation body (5); It is characterized in that; Said body (1) is that end face and bottom surface are parallel to each other, two square bodies that the side is parallel to each other, and said runner (6) is for running through the square hole of body from the forward and backward surface of said body (1).

2. according to the described steady state flow entire body of claim l, it is characterized in that the front surface of said body (1) is the outer convex surface of arc.

3. steady state flow entire body according to claim 2 is characterized in that, the rear surface of said body (1) is the outer convex surface of arc.

4. according to claim 1,2 or 3 described steady state flow entire bodies; It is characterized in that; On the sidewall of said body (1), have the through wires hole (4) that the cross-under lead is used; Said through wires hole (4) respectively with said body (1) on two said probe mounting holes (2) be connected, the upper and lower port of said through wires hole (4) is opened end face and the bottom surface at said body (1) respectively.

5. according to claim 1,2 or 3 described steady state flow entire bodies, it is characterized in that said vortex generation body (5) is trapezoidal prism for the cross section, upper and lower two the drainage faces on the said prism are cancave cambered surface.

6. steady state flow entire body according to claim 4 is characterized in that, said vortex generation body (5) is trapezoidal prism for the cross section, and upper and lower two the drainage faces on the said prism are cancave cambered surface.

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