CN205138560U

CN205138560U - Vortex flowmeter

Info

Publication number: CN205138560U
Application number: CN201520955125.XU
Authority: CN
Inventors: 贾海涛
Original assignee: Beijing Haotianguangda Instrument Technology Co Ltd
Current assignee: Beijing Haotianguangda Instrument Technology Co Ltd
Priority date: 2015-11-26
Filing date: 2015-11-26
Publication date: 2016-04-06
Anticipated expiration: 2025-11-26

Abstract

The utility model relates to a vortex flowmeter, including body, vortex street sensor and triangle pole, wherein the body is the tubulose, and the both ends of body are provided with liquid outlet and inlet respectively, and vortex street sensor and triangle pole all set up at this internally. The utility model provides a vortex flowmeter, design science, simple structure can not detect the vibrations interfering signal of pipeline, the lower limit is low, goes up the limit for height, can reach 11ms after the improvement system backpressure, and a small amount of gassiness does not influence the measurement, downhole tool and overall dimension contradiction can be effectively improved, the test of big discharge capacity is satisfied, the low power dissipation, it is available battery powered, can satisfy practical application's needs well.

Description

Vortex shedding flow meter

Technical field

The utility model belongs to fluid measurement instrument technical field, is specifically related to a kind of vortex shedding flow meter.

Background technology

A bluff body laid in a fluid by vortex shedding flow meter, and fluid is alternately separated in shedder both sides, discharges two strings staggered vortex regularly, and the flowmeter that is directly proportional to flow of vortex shedding frequency within the specific limits.

Vortex shedding flow meter is according to the volumetric flow rate of toll bar (Karman) vortex street principle measurement gas, steam or liquid, the volumetric flow rate of mark condition or mass rate.When Karman vortex street cause fluid flows through bluff body, fluid is peeled off from bluff body both sides, forms eddy current alternately.This eddy current replaced, makes the spot speed of bluff body two side liquid different.Fluid velocity is different, and the instantaneous pressure that bluff body both sides are subject to is also different, therefore makes bluff body vibrate.Vibration frequency is directly proportional to fluid velocity, is inversely proportional to the frontal width of bluff body.

Utility model content

For above-mentioned problems of the prior art, the purpose of this utility model is to provide a kind of vortex shedding flow meter avoiding occurring above-mentioned technological deficiency.

In order to realize above-mentioned utility model object, the technical solution adopted in the utility model is as follows:

A kind of vortex shedding flow meter, comprise body 7, vortex street sensor 1 and triangular prism 2, wherein said body 7 is tubulose, and the two ends of described body 7 are respectively arranged with liquid outlet 3 and inlet 4, and described vortex street sensor 1 and described triangular prism 2 are all arranged in described body 7.

Further, described vortex street sensor 1 comprises Differential Detection electrode 5 and exciting electrode 6, and described Differential Detection electrode 5 and described exciting electrode 6 are all arranged on described vortex street sensor 1.

The vortex shedding flow meter that the utility model provides, design science, structure is simple, can't detect the vibrations undesired signal of pipeline; Lower limit low (0.2m/s), upper limit for height (8m/s), can reach 11m/s after improving system back pressure, a small amount of gassiness does not affect measurement (when conducting liquid is continuous phase); Effectively can improve subsurface tool and Outside Dimensions contradiction, meet huge discharge test; Low in energy consumption, usable-battery is powered, and can meet the needs of practical application well.

Accompanying drawing explanation

Fig. 1 is sectional view in the horizontal direction of the present utility model;

Fig. 2 is sectional view vertically of the present utility model;

Fig. 3 is Cleaning Principle schematic diagram of the present utility model;

Fig. 4 is circuit block diagram of the present utility model;

In figure, 1-vortex street sensor, 2-triangular prism, 3-liquid outlet, 4-inlet, 5-Differential Detection electrode, 6-exciting electrode, 7-body.

Embodiment

In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with the drawings and specific embodiments, the utility model is described further.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.

As shown in Figure 1 and Figure 2, a kind of vortex shedding flow meter, comprise body 7, vortex street sensor 1 and triangular prism 2, wherein said body 7 is tubulose, the two ends of described body 7 are respectively arranged with liquid outlet 3 and inlet 4, and described vortex street sensor 1 and described triangular prism 2 are all arranged in described body 7.Described vortex street sensor 1 comprises Differential Detection electrode 5 and exciting electrode 6, and described Differential Detection electrode 5 and described exciting electrode 6 are all arranged on described vortex street sensor 1.

According to physics principle, from microcosmic, the Conducting forms of object has free electron conduction, hole conduction, ionic conduction three kinds.Liquid conduction is based on ionic conduction, and the conductive capability of liquid should be the summation of all ionic conduction effects, and the movement velocity of ion self should affect to some extent on the conductive capability of liquid.

Fluid impedance just this ionic conduction effect summation bulk parameter express, so the impedance of working fluid should be relevant with liquid flow velocity.In addition, the flowing of liquid also can make to produce friction between liquid and liquid and between liquid and solid pipeline, thus makes some solid particle in liquid charged, as metallic particles, iron rust etc.And along with the quickening of liquid flow velocity, charged particle quantity will increase, and make the conductive capability of liquid increase, impedance will reduce.

As shown in Figure 3, atwirl whirlpool head is through the difference by both of sensor and whirlpool tail opposing straight, and after whirlpool head and sensor rub, energy consumes disperse very soon, until next whirlpool head arrives.

The impedance change signal that the velocity contrast that vortex street sensor 1 measures whirlpool different parts causes, can be observed to present near sinusoidal ripple figure at oscillograph after amplification filtering.

For preventing electrode polarization, pumping signal adopts AC constant-current source excitation.

As shown in Figure 4, DDS opens analog switch with fixed frequency, and the electric current in Huo Lande bidirectional constant source is sent into exciting electrode, and on receiving electrode, when the whirlpool head of High Rotation Speed causes impedance to reduce pulse through out-of-date, whirlpool tail flows through relatively gently, and impedance recovers gradually.After first order AMP impedance transformation, filter out-band external noise (particularly low frequency nearly direct current section noise), send frequency overlapped-resistable filter to enter A/D converter after the AMP process of the second level.The data gathered form data and curves stored in FLASH after template is explained.

Advantage of the present utility model: the vibrations undesired signal that can't detect pipeline; Lower limit low (0.2m/s), upper limit for height (8m/s), improving system pressure can reach 11m/s, and a small amount of gassiness does not affect measurement (when conducting liquid is continuous phase); Effectively can improve subsurface tool and Outside Dimensions contradiction, meet huge discharge test; Low in energy consumption, usable-battery is powered.

The above embodiment only have expressed embodiment of the present utility model, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be as the criterion with claims.

Claims

1. a vortex shedding flow meter, it is characterized in that, comprise body (7), vortex street sensor (1) and triangular prism (2), wherein said body (7) is tubulose, the two ends of described body (7) are respectively arranged with liquid outlet (3) and inlet (4), and described vortex street sensor (1) and described triangular prism (2) are all arranged in described body (7).

2. vortex shedding flow meter according to claim 1, it is characterized in that, described vortex street sensor (1) comprises Differential Detection electrode (5) and exciting electrode (6), and described Differential Detection electrode (5) and described exciting electrode (6) are all arranged on described vortex street sensor (1).