CN202382774U - Impeller structure for micro turbine flow meter - Google Patents

Abstract

The utility model discloses an impeller structure for a micro turbine flow meter. The impeller structure comprises an impeller arranged on a rotating shaft. The impeller structure is characterized in that a spiral blade is machined on the outer wall of the impeller, permanent magnet steel is arranged in the impeller, and the N/S pole of the permanent magnet steel points an axis perpendicular to the rotating shaft. By adopting the spiral blade, the friction resistance of fluid, which is generated on the spiral blade, is greatly reduced; the permanent magnet steel is cast in the impeller and uniformly and continuously runs together with the impeller, pulse is in proportion to the rotating speed of the permanent magnet steel, and the rotating speed of the permanent magnet steel is in proportion to the flow rate of the fluid, so that the measurement precision of the flow rate is improved.

Description

A kind of miniature turbine flowmeter is used blade wheel structure

Technical field:

The utility model relates to the flowmeter technology field, relates in particular to a kind of miniature turbine flowmeter and uses blade wheel structure.

Background technology:

Common existing turbo flow meter has directly assembled board-type blade wheel in flowmeter shell, the straight blade wheel is supported on the center line of metering cavity by bearing assembly.Promotion lower straight-plate blade movement at fluid; The straight blade cutting is installed on the magnetic line of force of the permanent-magnet steel on the housing during running; Utilize sensor to receive and respond to into pulse signal and send, the flow of this pulse signal and fluid is proportional, has just obtained data on flows through the acquisition pulse signal.

Usually the conventional turbine flowmeter that designs; When fluid is flowed through board-type blade wheel; Board-type blade wheel has an incident angle relatively, thereby when board-type blade wheel rotates, has both produced frictional resistance, produces viscous resistance again; And these two resistances all are directly proportional with the viscosity of liquid, and promptly the big more resistance of viscosity is also just big more.

Housing and board-type blade wheel gap between them are bigger; Therefore when dielectric viscosity was big, board-type blade wheel rotational resistance increased, and medium has flowed out in very big gap; This moment, signal and flow just can not become proportionate relationship, caused great error in dipping.

Permanent-magnet steel is relatively large to the magnetic resistance moment that board-type blade wheel produces through low discharge the time, has also influenced the normal rotation of board-type blade wheel simultaneously.

The utility model content:

The purpose of the utility model provides a kind of miniature turbine flowmeter and uses blade wheel structure, and structural design is novel, has improved the accurate measurement of flowmeter, the fluid metering of the low flow velocity tiny flow quantity of particularly suitable.

The technical scheme of the utility model is following:

The miniature turbine flowmeter is used blade wheel structure, includes the impeller that is installed in the rotating shaft, it is characterized in that: be processed with helical blade on the described impeller outer wall, be provided with permanent-magnet steel in the impeller.

Described miniature turbine flowmeter is used blade wheel structure, it is characterized in that: the N/S utmost point directed in orthogonal of described permanent-magnet steel is in the axis of rotating shaft.

The utility model has the advantages that:

1, helical blade has been adopted in design: fluid is during through any different radii on the helical blade; Flow direction is all parallel with the angle of helical blade; Making that fluid is identical with the impeller sense of rotation does not have angle, so the frictional resistance that fluid produces on blade reduces greatly.

2, bury the casting permanent-magnet steel in the impeller of design; Permanent-magnet steel and impeller one; Even and continuous running; Sensor receives pole change and converts the pulse of continuous homogeneous electric signal into, and the rotating speed of this pulse and permanent-magnet steel is proportional, and the rotating speed of permanent-magnet steel is proportional with the flow of fluid.

Description of drawings:

Fig. 1 is the structural representation of the utility model.

Fig. 2 is the cut-open view of the utility model.

Embodiment:

Referring to Fig. 1,2:

The miniature turbine flowmeter is used blade wheel structure, includes the impeller 2 that is installed in the rotating shaft 1, is processed with helical blade 3 on impeller 2 outer walls, is provided with permanent-magnet steel 4 in the impeller 2.

The N/S utmost point directed in orthogonal of permanent-magnet steel 4 is in the axis of rotating shaft 1.

The principle of work explanation:

Helical blade 3 and imbed the inner permanent-magnet steels of impeller 24 and lean on special bearing assembly to be supported in the flowmeter shell; And rely on adjustable screw blade 3 to be positioned at the center of housing, through housing be placed on permanent-magnet steel 4 directly over sensor carry out signal collection.When flow of liquid through and promote the blade rotation of helical blade 3, drive permanent-magnet steel 4 simultaneously and rotate, the conversion of sensor sensing magnetic pole is also sent pulse signal, is transferred in the amplifying circuit on top.

Claims (2)

1. a miniature turbine flowmeter is used blade wheel structure, includes the impeller that is installed in the rotating shaft, it is characterized in that: be processed with helical blade on the described impeller outer wall, be provided with permanent-magnet steel in the impeller.

2. miniature turbine flowmeter according to claim 1 is used blade wheel structure, it is characterized in that: the N/S utmost point directed in orthogonal of described permanent-magnet steel is in the axis of rotating shaft.

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