CN2098009U

CN2098009U - Electromagnetic flowmeter

Info

Publication number: CN2098009U
Application number: CN 91217850
Authority: CN
Inventors: 姜渝; 黄保春
Original assignee: GUANGHUA METER FACTORY SHANGHAI
Current assignee: GUANGHUA METER FACTORY SHANGHAI
Priority date: 1991-07-12
Filing date: 1991-07-12
Publication date: 1992-03-04

Abstract

The utility model discloses an electromagnetic flowmeter which is used in measuring the volume flow of medium and conducting solution, wherein, the conducting solution comprises acid conducting solution, alkali conducting solution, and salt conducting solution; the medium comprises pulp and mud. The utility model is characterized in that a measuring tube and a guard shield are integrated as a whole to use electrical insulating and corrosion resistant non-permeability magnetic materials for the casting or the injection molding of a through circular tube; excitation coils and a magnetic yoke are encapsulated in the wall of the circular tube. The utility model has the advantages of simple manufacture process, good sealing performance, low cost, compact structure, etc. The electromagnetic flowmeter is suitable for a long-term use in a poor environment in which immersion, or dampness, or acid fog occurs easily.

Description

Electromagnetic flowmeter

The utility model relates to a kind of measuring tube and guard shield unites two into one, pour into a mould or be injection molded into one with electrical isolation, corrosion resistant non-magnet material, field coil and yoke are encapsulated in the electromagnetic flowmeter of measuring in the tube wall, are used to measure the volumetric flow rate of media such as acid, alkali, salt conducting solution and ore pulp, mud.

Chinese patent CN2072215U discloses a kind of ceramic flowmeter, and its measuring tube is the straight-through pipe of pottery that two ends do not have flange, and the measuring tube outside comprises that two annulus end faces are cast with the fiberglass sheath, and yoke and field coil are encapsulated in the sheath.This flowmeter has advantages such as anticorrosive wear-resistant, ceramic pipe moulding process be simple.But the outer cast glass steel sheath complex process of ceramic measuring tube, the cost height, in the use with the measured medium contact portion except that ceramic pipe, also has a bit of fiberglass sheath, its corrosion-proof wear performance is than ceramic pipe difference, it is anti-corrosion to bring into play the stupalith height, the advantage of high abrasion, and cost is higher than the fiberglass electromagnetic flowmeter far away, and, when temperature variation, can influence adhesion between the two, even produce the slit because pottery is different with the thermal expansivity of fiberglass, measured medium is infiltrated along the slit, can influence the dielectric strength between the signal electrode when serious, so that cause short circuit, cause flowmeter normally to use.

The purpose of this utility model provides simple, the good seal performance of a kind of pouring technology, and cost is low, the electromagnetic flowmeter of compact conformation.

The utility model is achieved in that a kind of electromagnetic flowmeter comprises that the circulation measured medium carries out the measuring tube of flow measurement, produces the field coil and the yoke in work magnetic field, the detecting electrode of flow signal, ground-electrode and guard shield, said guard shield and measuring tube are to pour into a mould with uniting two into one or be injection molded into a straight-through pipe with electrical isolation, corrosion resistant non-magnet material, and field coil and yoke are encapsulated in the tube wall of this pipe.

Now in conjunction with the accompanying drawings and embodiments the utility model is done and is described in further detail:

Fig. 1 is an axial section synoptic diagram of the present utility model;

Fig. 2 is a radial section synoptic diagram of the present utility model;

As shown in the figure, electromagnetic flowmeter comprises field coil 1, iron core 2(heavy caliber electromagnetic flowmeter is not established, down together), yoke 3, ground-electrode 4, detecting electrode 5 and measuring tube 6, measuring tube 6 is by electrical isolation, a corrosion resistant non-magnet material cast or a straight-through pipe that is injection molded into, field coil 1, two radial sections of iron core 2 usefulness are horseshoe-shaped yoke 3 and surround, field coil 1, iron core 2 and yoke 3 are encapsulated in the tube wall of measuring tube 6, with by field coil 1, on vertical measuring tube 6 tube walls of the magnetic line of force that iron core 2 and yoke 3 produces two detecting electrodes 5 are housed, parallel with this magnetic line of force and two ground-electrodes 4 are housed near on the tube wall at measuring tube 6 two ends.During manufacturing, after field coil 1, iron core 2, yoke 3 and ground-electrode 4 pre-assembled, accurately be positioned in the mould, make, will vacuumize before the cast to guarantee that cast fully with fiberglass or poured with epoxy resin encapsulation together with detecting electrode 5.Also can carry out the injection moulding encapsulation with the engineering plastics that are suitable for injection moulding (as PVC).Cast or injection moulding material therefor can be selected according to the character of measured medium.The pipe thickness at measuring tube interlayer position is generally 5～10mm.

The utility model since measuring tube and guard shield unite two into one, pour into a mould or be injection molded into one with commaterial, it had both had the effect of guard shield, play the function of measuring tube again, and manufacturing process was much simpler than the outer cast glass steel sheath of ceramic measuring tube.Two detecting electrodes are by the same material encapsulation and kept apart fully, do not have two kinds of material expansion coefficient differences, and temperature variation causes gap leakage and causes insulation to descend or short circuit phenomenon.Consider that there is the coefficient of thermal expansion difference in encapsulating material with metal detection electrode and ground-electrode, influence the adhesion of the two during temperature, for preventing to produce the slit, cause the medium seepage, can take outside leakage-proof structure,, guarantee its sealing as on contact conductor, adding measures such as O-ring seal.The utility model all is packaged into an entity securely with all building blocks, compact overall structure not only, and have tight waterproof, dustproof, the gas-tight characteristics are suitable for use for a long time under mal-conditions such as easily immersion, humidity, acid mist.

Claims

1, a kind of electromagnetic flowmeter, comprise the measuring tube 6 that the circulation measured medium carries out flow measurement, the field coil 1 in generation work magnetic field and yoke 3, flow signal detecting electrode 5, ground-electrode 4, and guard shield, it is characterized in that guard shield and measuring tube 6 are to pour into a mould with uniting two into one or be injection molded into a straight-through pipe with electrical isolation, corrosion resistant non-magnet material, field coil 1 and yoke 3 are encapsulated in this pipe wall.