AK Swirl Vortex Flow Meter

Illustrate

AK Swirl Vortex Flow Meter

General Introduction

Intelligent Swirl flow meter developed by our company is a new flow instrument at the leading level in our country. This instrument has a combined function of flow capacity, temperature and pressure measuring. It can also conduct auto compensation of temperature, pressure and compressibility factor. It is an ideal gas dosing instrument for petroleum, chemical, electricity and metallurgic industries.

Main Application

Intelligent Swirl flow meter is widely used in measuring various gas flow rate in petroleum, chemical, electricity and metallurgic industries and city gas supply.

Structure of Flow Meter

Structure of Flow meter
 
The flow meter is composed by the following seven basic parts (Figure 1):
                                                   
1. Vortex generator
It is made of aluminum alloy with a certain angle of helical blade, and is fixed at the front part of 
shell constriction. It forces the fluid to form strong eddy.
 
2. The shell 
It has flange with s certain shape of fluid flow passage; due to different operating pressure, material 
of the shell could adopts cast aluminum alloy or stainless steel. (Figure 1)
 
3. Integrating instrument of intelligent flow meter (Figure 3 shows the operating principles)

Integrating instrument is composed by temperature, pressure testing analog channel, digital channel of 
flow rate measuring and micro processing unit, LCD driver circuit and other support circuit, and is
 equipped with output signal interface.
 
 
4. Temperature pickup
With Pt100 platinum resistor as its sense organ, and with a certain range of temperature,
 resistance quantity shares correspondence relation with the temperature.
 
5. Pressure sensor
With Piezoresistive diffused silicon connection circuit as its sense organ, its bridge arm resistance
 will make contemplated change under outer pressure, so under effect of certain energizing current, 
potential difference at both output terminal share a direct proportion with outer pressure.
 
6. Piezoelectricity crystal probe
It is installed at the laryngeal part of the dilating section of the shell and can detect frequency 
signal of eddy movement.
 
7. Swirl reducer
It is fixed at exit section of the shell to reduce whirling current and thus reduce compact on the performance 
of instruments of lower reaches.
 
Operating principles
Flow through section plane of flow sensor is similar to shaped conductor of venture pipes (Figure 2). Fix a helical guide vane at entrance side, when the fluid enters the flow sensor, the guide vane will force the fluid form fierce vortex. When the fluid enters the dilating section, the vortex will begin the second rotation under influence of reflux and will form gyro vortex precession. Frequency of the precession shares a direct proportion with flow rate, free from influence of the fluid’s physical nature and density, therefore, precession frequency of the second rotation acquired by detecting element can obtain good linearity in a large scale of flow rate. Signals will be enlarged, filtered by the preamplifier and will change into pulse signal which shares a direct proportion with flow speed, then the signals will be sent to micro processing unit to be integrated together with detection signals of the temperature and pressure, finally, the measuring result will be displayed on the liquid crystal display (instantaneous delivery, integrated flux and temperature and pressure data)
. 

Flow rate and dimension

1 Flow Rate

Inside Nominal Diameter (mm)	Flow Range ( m3/ h)	Operatin Pressure ( MPa)	Accuracy (%)	Repetitiveness
15	1.5～12	1.6 2.5 4.0 6.3 10 16 25 42	1.0 1.5	Lower than one third  of the absolute  value of the limit  of intrinsic error
20	2～15
25	3.0～30
32	6.0～60
40	7.0～70
50	10～130
80	30～400
100	70～800
150	90～1000
200	190～1900

Table(2)

Inside Nominal  Diameter DN(mm)	Nominal Pressure (MPa)	Outside Measurement（mm）		Material of Outer Part		Weight (kg)
		Length of  Outer Part A	Height H	Stainless  steel	Aluminum  alloy
15/20	1.6/2.5/4.0	160	360	√	√	6
	6.3/10	160	365	√		8
25	1.6/2.5/4.0	180	367	√	√	7
	6.3/10	180	378	√		10
32	1.6/2.5/4.0	200	383	√	√	9
	6.3/10	200	402	√		12
40	1.6/2.5/4.0	200	383	√	√	9
	6.3/10	200	402	√		12
50	1.6/2.5/4.0	230	403	√		11
	6.3/10	230	421	√		14
80	1.6	330	438	√	√	11
	2.5/4.0	330	438	√		18
	6.3/10	330	446	√		21
100	1.6	410	468	√	√	14
	2.5/4.0	410	475	√		18
	6.3/10	410	483	√		33
150	1.6	585	542	√	√	21
	2.5/4.0	585	549	√		52
	6.3/10	585	572	√		72
200	1.6	700	618	√	√	41
	2.5	700	626	√		117
	4.0	700	634	√		127