CN2357155Y

CN2357155Y - Eccentric detecting element for internal and external magnetic rotor of magnetic pump

Info

Publication number: CN2357155Y
Application number: CN 98220956
Authority: CN
Inventors: 丛玉良; 刘凯
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-04-28
Filing date: 1998-04-28
Publication date: 2000-01-05
Anticipated expiration: 2008-04-28

Abstract

The utility model relates to a detecting element for spacer sleeve abrasion caused by eccentricity of internal and external magnetic rotors of a magnetic pump. The detecting element of the utility model is inductance coils, which are wound in single layer, are uniformly distributed on the surface of the excircle of a spacer sleeve in the radial direction. The detecting element acquires detecting signals which are led out to be processed, compared and judged, and when the detecting signals achieve a limit value, alarm is made. The utility model can effectively realize real-time detection and eliminate hidden dangers which threaten the safe running of the magnetic pump, and the utility model has high accuracy ratio.

Description

The inside and outside magnet rotor eccentricity detecting element of magnetic drive pump

The utility model relates to the detection device that the inside and outside magnet rotor off-centre of a kind of magnetic drive pump causes the Detecting element of spacer wearing and tearing and uses this Detecting element, belongs to the input field.

Magnetic drive pump is a kind of static seal no-leakage pump, but it is in long-time running, and owing to reasons such as bearing wear can cause inside and outside magnet rotor off-centre, inside and outside magnet rotor is eccentric to be surpassed when a certain amount of, spacer will wear and tear, because of spacer is a thin-wall part, very easily scratch and gall, spacer is in case gall, dielectric leakage will take place, befouling environment, even blast on fire cause heavy economic losses.Domestic, yet there are no related detection element and device abroad and come into operation.

The purpose of this utility model is to provide a kind of accuracy rate height, safety, inside and outside magnet rotor eccentricity detecting element of magnetic drive pump that applicability is strong of detecting.

The purpose of this utility model is achieved through the following technical solutions:

During the magnetic drive pump bearing wearing and tearing, can cause inside and outside magnet rotor off-centre, make between the inside and outside magnet rotor that magnetic intensity changes everywhere, respond to the changing value of magnetic intensity everywhere by detection, thereby the eccentric situation of can effective monitoring inside and outside magnet rotor is in case the spacer wearing and tearing cause damage.

Concrete scheme is as follows: the inductor coil radially uniform at the spacer outer round surface, that the coiling of individual layer face forms, the variation in coil-induced inside and outside magnet rotor magnetic field, induced signal is drawn, handle, compare, judge by detection device, when reaching spacing value, send alarm signal and cut off the magnetic drive pump power supply.During work, the inside and outside magnet rotor of magnetic drive pump interacts and rotates, and the inductor coil on uniform spacer surface is done relative movement in the magnetic field that inside and outside magnet rotor forms, and cutting magnetic line produces induction electromotive force; Under the normal condition, inside and outside magnet rotor does not have off-centre, being distributed in the induction electromotive force that the inductor coil at any place of spacer radial surface produces under the action of a magnetic field equates, when off-centre takes place in inside and outside magnet rotor, the induction electromotive force of spacer radial surface inductor coil generation everywhere changes, and the gap, somewhere increases, and then should reduce by the coil-induced electromotive force in place, otherwise then increase, reach by the variation that detects several places inductor coil induction electromotive force and detect the eccentric purpose of inside and outside magnet rotor.

Inductor coil is limited by the gap (about 3-5 millimeter) between inside and outside magnet rotor, about 1 millimeter of spacer wall thickness, thereby need to adopt the fine enamelled wire coiling to form, also can make around the wiring form by printed circuit solder plate or copper cash board plane.

Inductor coil should be no less than two groups along the spacer radial circumference is uniform, and radial circumference is uniform to be uniform at any same radial circumference of spacer front end, rear end, middle-end and spacer outer round surface.

The inside and outside magnet rotor Accentric detector of magnetic drive pump includes the signal conversion circuit that links to each other with Detecting element in regular turn, first differential circuit that links to each other with any two groups of signal conversion circuit output terminals, with fixed value and one group of first second differential circuit that the differential circuit output terminal links to each other, with the comparator that the upper and lower limit place value and the second differential circuit output terminal link to each other, the control relay coil that links to each other with comparator output terminal.

Inside and outside magnet rotor eccentricity detecting element of magnetic drive pump of the present utility model and detection device, can effectively realize causing the real-time detection of spacer wearing and tearing because of the magnetic drive pump bearing wearing and tearing make inside and outside magnet rotor off-centre, eliminate the major hidden danger that threatens the magnetic drive pump safe operation, detection accuracy height, reliable, convenient, the promotion and application of the magnetic drive pump of can making greater efforts to promote.

Description of drawings is as follows:

Fig. 1: magnetic drive pump structural representation;

Fig. 2: the inside and outside magnet rotor of magnetic drive pump, spacer, Test coil profile figure;

Fig. 3: Detecting element coiling figure;

Fig. 4: detection device schematic diagram.

Below in conjunction with accompanying drawing, provide specific embodiment of the utility model, be used for further specifying the utility model.

Embodiment 1, referring to figs. 1 to Fig. 4, the inside and outside magnet rotor eccentricity detecting element of present embodiment magnetic drive pump is the inductor coil radially uniform at the spacer outer round surface, that the coiling of individual layer finish paint envelope curve forms, inductor coil is three groups, uniform along spacer front end radial circumference, during use, this Detecting element is axially discharged along spacer, stick with glue knot on spacer.

Among Fig. 1, magnetic drive pump is made up of outer magnet rotor 4, interior magnet rotor 6, spacer 5, bearing 2 and bearing 8, axle 1 and axle 7, impeller 9 and casing 3.The about 3-5mm in gap between inside and outside magnet rotor, the about 1mm of spacer wall thickness, thereby used Detecting element enameled cable diameter is 0.05-0.1mm.

Fig. 4 is a detection device, and three groups of Detecting elements 10 are respectively X, Y, Z, produce V respectively _x, V _y, V _zInduced electromotive force is transformed into corresponding direct current signal Vx, Vy, Vz through signal conversion circuit respectively, and three direct current signals insert first differential circuit in twos and subtract each other, and gets V _A=K (Vx-Vy), V _B=K (Vy-Vx), V _C=K (Vy-Vx) is more respectively with V _A, V _B, V _CInsert second differential circuit, subtract each other with fixed value V respectively, get V ₁=V-V _A, V ₂=V-V _B, V ₃=V-V _C, with V ₁, V ₂, V ₃Insert voltage comparator respectively and compare, work as V ₁, V ₂, V ₃In any one exceeds the upper limit value and lower limit value V that voltage comparator is set _H, V _LThe time, the comparator output low level, alarm takes place in the relay J ON Action, cuts off the electricity supply.

Embodiment 2, and present embodiment and embodiment's 1 difference is: Detecting element 10 is five groups, and Detecting element 10 employing printed circuit solder plates or copper cash plate, plane parallel are made around the wiring form, axially discharge along spacer in spacer 5 outer round surface rear ends.

More than two embodiments' inside and outside magnet rotor eccentricity detecting element of magnetic drive pump and detection device, all can effectively realize real-time detection to inside and outside magnet rotor off-centre, eliminate the major hidden danger that threatens the magnetic drive pump safe operation, the accuracy height.

Claims

1, the inside and outside magnet rotor eccentricity detecting element of magnetic drive pump is characterized in that Detecting element is an inductor coil radially uniform at the spacer outer round surface, that the coiling of individual layer face forms.

2,, it is characterized in that described inductor coil is the enameled cable coiling according to magnet rotor eccentricity detecting element inside and outside the described magnetic drive pump of claim 1.

3,, it is characterized in that described inductor coil is that printed circuit solder plate or copper cash board plane are around the wiring coiling according to magnet rotor eccentricity detecting element inside and outside the described magnetic drive pump of claim 1.

4,, it is characterized in that Detecting element is that radially circumference uniform distribution is no less than two groups inductor coil according to magnet rotor eccentricity detecting element inside and outside claim 1 or the 2 or 3 described magnetic drive pumps.

5, according to magnet rotor eccentricity detecting element inside and outside the described magnetic drive pump of claim 4, it is characterized in that described radial circumference uniform for spacer front end, rear end, middle-end and any same radial circumference of spacer outer round surface uniform.