CN2341124Y

CN2341124Y - Magnetic impeller sensing flow meter

Info

Publication number: CN2341124Y
Application number: CN 98213011
Authority: CN
Inventors: 朱善梁
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-02-18
Filing date: 1998-02-18
Publication date: 1999-09-29
Anticipated expiration: 2008-02-18

Abstract

The utility model belongs to an impeller type flow meter. The utility model is characterized in that an impeller shaft is arranged in a magnetic force line stably in balance. The fluid makes radial motion to push an impeller blade to rotate, which is designed according to the moment balance principle. The utility model has simple structure and is a novel magnetic impeller sensing flow meter with the advantages of applying the characteristic of permanent magnetic materials as a support.

Description

Magnetic impeller sensing flowmeter

The utility model belongs to flow instrument, particularly a kind of magnetic impeller sensing flowmeter.The turbo flow meter of present domestic use, in use distinct issues are that operation back precision changes, and mainly are that variation is drawn in bearing wear.Shortened a serviceable life of flowmeter, often change and repair.Main cause is: preceding baffle adopts some parallel blades to form and leads straight fluid and accelerating fluid, and the fluid behind preceding baffle produces axial thrust to the about 45 ° some turbine wheel blades of axial angle, causes the axial load friction.Because: the friction of flow velocity direct ratio load.Therefore shortened the serviceable life of turbo flow meter.

The utility model purpose is at above-mentioned shortcoming, and a kind of elimination axial thrust is provided, and reaches a kind of flowmeter of a long service life.

The technical solution of the utility model 1: the diversion trench that the some axially parallel blades on the preceding baffle of turbo flow meter is made into 30 °-60 ° of some axial angles, correspondingly make the about 45 ° of blades of the some axial angles on the turbine wheel into some axially parallel blades, the change of these two kinds of blade constructions, thereby changed axial thrust, eliminated axial load and friction.

The technical solution of the utility model 2: adopt the characteristic of permanent magnet material, the impeller shaft bearings at both ends is shed, principle and magnetic line of force principle by magnetic and steel are inhaled allow spindle balance be stable at the center.Eliminate the rolling friction that bearing brings.

Major advantage of the present utility model: eliminated axial thrust and radial rolling friction during flowmeter work, prolonged serviceable life one time.

In addition the utility model also have simple and reasonable, reliable operation, advantage such as measurement range is wide, and the pressure loss is little.

Below in conjunction with drawings and Examples the utility model is described in further detail:

It Fig. 1, is first kind of embodiment of the utility model: the structural representation of magnetic impeller sensing flowmeter.

It Fig. 2, is second kind of embodiment of the utility model: the structural representation of magnetic impeller sensing flowmeter.

Among Fig. 1,2: 1. housing, 2. before baffle, 3. impeller, 4. spool, 5. sensing chip or gear, 6. permanent magnet material, 7. back baffle or bearing support, 8. sensing coil or counter, 9. bypass nozzle, 10. constrictor.

As Fig. 1, the utility model magnetic impeller sensing flowmeter mainly by housing 1, is installed in the preceding baffle 2 in the housing 1, impeller 3, and sensing chip 5, permanent magnet material 6, and back baffle 7, sensing coil 8 is formed.It is characterized in that: preceding baffle adopts 30 ° of-60 ° of diversion trenchs 2 of some axial angles, impeller 3 is some axially parallel blades, 30 °-90 ° of impeller shaft 4 two ends wedge angles, back baffle 7 are used for rectification and reduce the flow field disturbing influence, also can be used as the bearing support of an end permanent magnet material.

Fig. 2, be second kind of embodiment of the utility model magnetic propeller flowmeter, substantially be same as Fig. 1, different is to increase the initiating flow performance on the basis of Fig. 1, its principle: at flow hour, import 11 and outlet 12, the little and little condition of the little dynamic pressure of flow velocity of pressure reduction, impeller 3 incompetent work, be secured on the big circulation road when constrictor 10 is subjected to the big condition of inside static pressure, this moment, little airflow was flow through by the bypass nozzle, thereby had changed original condition because of sectional area is little, little nozzle hydrodynamic is big, promote impeller 3 and rotate, when flow increases, outlet 12 and import 11, pressure reduction is pushed constrictor 10 greatly open, enters big, the gage work of middle flow.

Principle of work of the present utility model is: fluid is flowed into by import 11, and when preceding baffle 2, fluid transfers 30 ° of-60 ° of thrusts of axial angle to, and impeller 3 blades are subjected to thrust and have rotating force.Impeller shaft 4 is that the steel two ends are in magnetic condition and magnetic line of force condition, can balance, be stable at the center.Under certain condition, rotating speed is directly proportional with flow velocity.Owing to have sensing chip 5 on the impeller shaft 4, sensing chip 5 has the magnetic of containing material, it is in the magnetic field of input sensing coil 8, sensing chip 5 cutting magnetic lines of rotation, the periodic magnetic flux that changes sensing coil, thereby make two ends induce the electric impulse signal that is directly proportional with volumetric flow rate, through the flow integrator processes and displays.Or by the 5 drive counters of the gear on the impeller shaft 4.

Claims

1, a kind of magnetic impeller sensing flowmeter.It comprises instrument housing 1, the preceding baffle 2 in the housing 1, and impeller 3, permanent magnet material 6, sensing chip or gear 5, sensing coil or counter 8 and bypass are provided with 9.It is characterized in that adopting the preceding baffle 2 and the axially parallel blade impeller 3 of 30 ° of-60 ° of diversion trenchs of 6-24 bar axial angle, and impeller shaft 4, two ends are the structure of supporting with permanent magnet material 6.

2, a kind of magnetic impeller sensing flowmeter according to claim 1.It is characterized in that: impeller 3 is the axial parallel blade of 8-16 sheet.30 °-90 ° of impeller shaft 4 two ends wedge angles.

3, a kind of magnetic impeller sensing flowmeter according to claim 1.It is characterized in that: the supporting member permanent magnet material 6 outside impeller shaft 4 two ends, magnetic content are 800-4000 Gauss.

4, according to claim 1,2,3 described magnetic impeller sensing flowmeters, it is characterized in that: preceding baffle 2 is 30 ° of-60 ° of diversion trenchs of 6-24 bar axial angle; Impeller 3 is the axial parallel blade of 8-16 sheet; 30 °-90 ° of impeller shaft 4 two ends wedge angles; Impeller shaft 4 two supports spare permanent magnet material magnetic content 800-4000 Gausses; Reaching to use the permanent magnet material characteristic is a kind of magnetic impeller sensing flowmeter of supporting.