CN2283235Y

CN2283235Y - Impeller sensing flowmeter

Info

Publication number: CN2283235Y
Application number: CN 96220231
Authority: CN
Inventors: 朱善梁
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-07-30
Filing date: 1996-07-30
Publication date: 1998-06-03
Anticipated expiration: 2006-07-30

Abstract

The utility model belongs to an impeller wheel sensing flowmeter. The utility model is characterized in that the structures of a plurality of front guiding fluids of the axial 40-60 deg blades and straight blade impeller wheels are adopted, and the flow direction of the fluid is changed to push the straight blade impeller wheel to rotate. The impeller sensing flowmeter has the advantages of removing axial friction, reducing bearing friction, and prolonging the service life of the flowmeter. In addition, the utility model also has the advantages of simple and reasonable structure, high precision, and is a novel impeller wheel sensing flowmeter.

Description

Impeller sensing flowmeter

The utility model belongs to flow instrument, particularly a kind of 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 bearing is easy to wear, and the transmission resistance changes, and has shortened a serviceable life of flowmeter, often repair and replacement.Main cause is: preceding baffle adopts axially parallel blade (straight sheet blade) to form and leads direct current bundle, the influence that reduces the flow field disturbance and the eddy current of eliminate fluid, the axial flow of fluid of leading behind the direct current bundle produces axial thrusts to axially about 45 ° some turbo blades, cause that axle that the rotation of axial rub and impeller causes and the friction between bearing increase, and have shortened a serviceable life of flowmeter.

The purpose of this utility model is at above-mentioned shortcoming, and a kind of minimizing axial thrust is provided, and reaches the impeller sensing flowmeter that reduces bearing wear.

The technical solution of the utility model is: make the axially parallel blade in the preceding baffle of old-fashioned turbo flow meter into axial 40 °～60 ° blade, accordingly the blade that certain angle is arranged in the former revolving wormgear is made into the impeller of axially parallel blade (straight leaf blade), the change of this blade construction, thereby the flow direction that has changed fluid changes thrust direction, be the axial thrust of eliminate fluid, eliminated axial rub the revolving part blade.

Major advantage of the present utility model: during the rotation of impeller sensing flowmeter impeller, eliminated axial rub, reduced bearing wear, prolonged serviceable life.The utility model also has simple and reasonable, reliable operation, advantages such as measurement range is wide, the pressure loss is little, anti-impurity in addition.

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

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

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

Among Fig. 1,2,1, housing, 2. before baffle, 3. impeller, 4. back baffle, 5. sensing chip, 6. sensing coil, 7, bearing, 8. rotary main shaft.

As shown in Figure 1 and Figure 2, impeller sensing flowmeter of the present utility model mainly by housing 1 and be installed in that preceding baffle 2, impeller 3, back baffle 4, sensing chip 5, sense line in the housing encloses 6, bearing 1 and rotary main shaft 8 form, baffle adopts the turbine of some axial 40 °～60 ° blades (being generally about 45 °) before it is characterized in that, impeller 3 is the axially parallel blade for prismatic blade.Forward and backward baffle (2,4) effect is the influence of leading the direct current bundle and reducing the flow field disturbance, also can be used as the support of bearing.And impeller 3 is fixedly mounted in the housing.

Fig. 1 and Fig. 2 are two kinds of embodiment of the utility model, and its principle design is identical; Just the Bearing Installation position is different, and all the other structures are identical; Sensing coil among Fig. 26 can make the magnetic transmission counter in addition.

Principle of work of the present utility model is: fluid is flowed into by import, when preceding baffle 2, fluid quickens, and transfer axial 40 °～60 ° thrusts to, the impeller 3 of straight leaf blade is subjected to the thrust of axial 40 °～60 ° of direction fluids, make impeller blade have rotating torque, impeller 3 rotations after overcome friction square and the fluid resistance square, stabilization of speed after equalising torque.Under certain conditions, rotating speed is directly proportional with flow velocity, because blade has magnetic conductivity, it is in the signal detector magnetic field of (being made up of coil), the blade cuts magnetic line of force of rotation, periodic variation closes the magnetic flux of coil, thereby makes the coil two ends induce the electric impulse signal that is directly proportional with volumetric flow rate, shows through flow integrator.

Claims

1, a kind of impeller sensing flowmeter, it comprises housing 1 and is installed in the interior preceding baffle (2) of housing (1), impeller (3), back baffle (4), sensing chip (5), sensing coil or magnetic counter (6), bearing (7) and main shaft (8), it is characterized in that impeller sensing flowmeter adopts the preceding baffle of some axial 40 °～60 ° of blades and the structure that the prismatic blade impeller is formed.

2, impeller sensing flowmeter according to claim 1, its feature are in axial about the 45 ° blade of the blade tilt of preceding baffle (2), and impeller (3) adopts big root footpath blade.