CN105651155A - Magnetic pump shaft position online monitoring device and magnetic pump shaft position online monitoring method - Google Patents

Abstract

The existing online detection device for the position of the magnetic pump shaft has a serious nonlinear relationship between the eccentricity of the shaft of the magnetic pump bearing and the change of the reluctance of the magnetic circuit. The detection accuracy is different when the eccentricity of the magnetic pump shaft is different. Detection accuracy. The invention discloses a novel on-line monitoring device and method for the rotating shaft position of a magnetic pump. The magnetic circuit structure of the detection probe is newly designed, and the additional rectangular magnetizer makes the eccentricity of the magnetic pump bearing shaft and the change of the magnetic resistance of the detection probe magnetic circuit have a linear relationship. The beneficial effects of the solution are: 1. The influence of the variation of the eccentricity of the magnetic pump shaft on the detection accuracy is reduced. 2. Reduce the impact of the axial movement and inclination of the magnetic pump shaft on the detection accuracy. 3. Improve the linearity, stability and reliability of the magnetic pump shaft position sensor. 4. Improve the measurement accuracy of the magnetic pump shaft position.

Description

Device and method for on-line monitoring of rotating shaft position of magnetic pump

technical field

The invention belongs to the field of displacement measurement. In particular, it refers to a method and device for on-line monitoring of the rotating shaft position of a magnetic pump.

Background technique

The magnetic pump is a sealless and leak-free pump. It consists of three parts: pump, permanent magnet coupling, and driving motor. The motor directly drives the outer rotor of the permanent magnet coupling. The magnetic field of the magnet on the outer rotor passes through the spacer sleeve and acts on the inner rotor magnet, and the inner rotor magnet drives the pump shaft. Drive the impeller in the pump body to rotate, and ensure that there is no leakage of the medium in the pump through the static isolation sleeve installed between the inner and outer magnetic rotors.

Since the magnetic pump adopts a closed structure, the internal sliding bearings of the pump rely on the conveyed medium to realize their own lubrication and cooling. The medium lubricity is often poor, and the sliding bearings are often severely worn due to poor lubrication. After wear, the radial clearance between the bearing bush and the shaft Increase, the rotor parts rotate loose, the rotor center deviates from the geometric center of the shaft, and when the sliding bearing wears seriously, the magnetic rotor in the magnetic pump will rub against the sealing isolation sleeve. If it is not detected in time, the inner magnetic rotor will wear through the isolation sleeve, which will not only cause medium leakage, but may also cause fire. In order to prevent such accidents, it is necessary to install a rotating shaft position detection device for the magnetic pump bearing. In the prior art, a detection probe is installed inside the isolation sleeve of the magnetic pump. When the inner rotor of the magnetic pump is eccentric due to wear and tear of the sliding bearing, the eccentricity of the detection wheel will change the radial distribution of the detection magnetic field, and the detection probe can obtain the change signal of the radial distribution of the magnetic field. , to obtain the eccentricity of the magnetic pump shaft. The prior art has the following disadvantages: 1. The detection magnetic field generated by the detection probe along the radial direction of the magnetic pump shaft is seriously non-linear, which greatly affects the detection accuracy. 2. During the working process of the magnetic pump, the detection wheel often moves and tilts in the axial direction, which reduces the detection accuracy.

Contents of the invention

The purpose of the present invention is to provide an on-line detection device for the rotating shaft position of the magnetic pump sliding bearing with strong anti-interference, high precision, good reliability and suitable for the structure of the magnetic pump, and at the same time provide an online monitoring method for the rotating shaft position of the magnetic pump.

The existing online detection device for the position of the rotating shaft of the magnetic pump has a serious nonlinear relationship between the eccentricity of the rotating shaft of the magnetic pump bearing and the change of the magnetic circuit reluctance. The detection accuracy is different when the eccentricity of the magnetic pump shaft is different. affect the detection accuracy. Through in-depth analysis of the existing technology and in-depth exploration of the structure of the magnetic pump, the present invention overcomes the problem that the labyrinth closed structure of the magnetic pump is difficult to design and install sensors, and proposes a new online monitoring device and method for the position of the magnetic pump shaft. The new monitoring device installs detection probes on both sides of the detection wheel, and produces a bilateral symmetrical detection magnetic field along the axial direction of the magnetic pump shaft. At the same time, the magnetic circuit structure of the detection probe is modified. The newly added rectangular magnetizer makes the magnetic pump shaft eccentric. The nonlinearity between the measurement and the magnetic resistance change of the detection probe magnetic circuit is greatly reduced. The beneficial effects of the solution are: 1. The influence of the variation of the eccentricity of the magnetic pump shaft on the detection accuracy is reduced. 2. Reduce the impact of the axial movement and inclination of the magnetic pump shaft on the detection accuracy. 3. Improve the linearity, stability and reliability of the magnetic pump shaft position sensor. 4. Improve the measurement accuracy of the magnetic pump shaft position.

The technical solution adopted by the on-line monitoring device for the position of the magnetic pump shaft of the present invention is: the on-line monitoring device for the position of the magnetic pump shaft comprises a magnetic pump isolation sleeve (1), 2N detection probes (17), 2 detection probe covers (18), a detection Wheel (19), inner magnetic rotor (3), inner sliding bearing bracket (10), left detection probe outlet pipe (11), right detection probe outlet pipe (12) and intelligent magnetic pump shaft position online monitoring circuit board (39) .

The inner and outer diameters and depths of the annular slot on the spacer sleeve of the magnetic pump and the annular slot on the inner sliding bearing support are the same, and are coaxial with the magnetic pump shaft.

2N detection probes are fixed on the isolation sleeve of the magnetic pump and the inner sliding bearing bracket.

Among them, N detection probes are fixed in the magnetic pump isolating ring-shaped slot from the right side, and a ring-shaped non-magnetic detection probe cover (18) is covered on the notch of the magnetic pump isolating ring-shaped slot, welded and connected , the left detection probe outlet pipe (11) is connected with the outlet hole in the isolation collar type embedding groove, the left detection probe outlet pipe, N detection probes, magnetic pump isolation sleeves, and the detection probe cover form an integrated structure.

In addition, N detection probes are fixed in the ring-shaped groove of the inner sliding bearing bracket from the left side, and are covered by another ring-shaped non-magnetic detection probe cover (18) on the ring-shaped groove of the inner sliding bearing bracket, welded Connect, the right detection probe outlet pipe (12) is connected with the outlet hole in the inner sliding bearing bracket ring-type embedding groove, the right detection probe outlet pipe, N detection probes, the inner sliding bearing support, and the detection probe cover also form an integrated structure.

The inner magnetic rotor is fixed on the magnetic pump shaft, and the ring-shaped detection wheel (19) made of magnetically conductive material is fitted on the inner magnetic rotor from the right side. The detection wheel is coaxial with the magnetic pump shaft, and its left end face is aligned with the left detection probe The distance between the right end face of the cover is equal to the distance between the right end face and the left end face of the right detection probe cover.

The detection probe comprises a magnetometer 1 (25), a magnetometer 2 (26), a magnetometer 3 (27), a magnetometer 4 (28), a magnetic field generator (29), a magnetic field sensitive body (30), a non-magnetic bracket ( 16).

The magnetic conductor 4 is inserted from the right side of the magnetic conductor 3, the long rectangular side of the rectangular column body of the magnetic conductor 4 is parallel to the long rectangular side of the rectangular column-shaped body of the magnetic conductor 3, and the non-magnetic conductive bracket is inserted from the left side of the magnetic conductor 3. On the magnetizer 4 cylindrical bodies, the right end face of the magnetizer 4 is coplanar with the right end face of the magnetizer 3 . The magnetic field sensitive body is inserted from the left side of the center hole of the non-magnetic bracket to offset the magnetizer 4, and the magnetizer 2 is inserted from the left side of the center hole of the non-magnetic bracket and offset against the left end surface of the inner boss, and the magnetic field generator is inserted from the non-magnetic bracket Support left side central circular hole inserts and offsets with magnetic conductor 2, and magnetic conductor 1 garden cylinder type body inserts non-magnetic conductive support central circular hole from magnetic conductor 3 left side at the front, and offsets with magnetic field generation body.

The center of the cylindrical magnetic field generating body of the 2N detection probes is equal to the distance from the center of the magnetic pump shaft, and the rectangular long sides of the 4-column body of the magnetizer of each detection probe are respectively connected to the cylindrical magnetic field generating body of the detection probe. The radial rays of the heart are parallel to the magnetic pump axis.

N is greater than or equal to 2; when N is equal to 2, the center of the cylindrical magnetic field generating body of the two detection probes on the same side of the detection wheel has an opening angle of 90 degrees to the axis of the magnetic pump; when N is greater than 2, the detection probes on the same side of the detection wheel Evenly distributed along the circumferential direction, the opening angles between adjacent detection probes are equal.

The detection probes on both sides of the detection wheel made of magnetic materials are symmetrically distributed to the center plane of the detection wheel. The radius is equal to the distance between the center of the cylindrical magnetic field generating body of the detection probe and the axis of the magnetic pump shaft.

The magnetic field generator in each detection probe is axially magnetized magnetic steel, the magnetic field sensitive body is a Hall element, the magnetizer 1, the magnetic field generator, the magnetizer 2, the magnetic field sensitive body, the magnetizer 3, the magnetizer 4 and the detection wheel form a closed magnetic circuit.

The online monitoring circuit board for the position of the rotating shaft of the intelligent magnetic pump is composed of 2N signal conditioning circuits and intelligent signal processing circuits. All the signal output lines are connected to 2N input ports of the intelligent signal processing circuit.

The online monitoring method of the magnetic pump shaft position of the present invention is as follows:

A. When the magnetic pump bearing wears, the detection wheel fixed on the magnetic rotor in the magnetic pump produces a radial displacement, and the magnetic resistance of the closed magnetic circuit composed of each detection probe and the detection wheel changes at the same time, and each detection probe is sensitive to the corresponding magnetic field. The body generates a response signal, and the intelligent signal processing circuit board receives the response signal of the magnetic field sensitive body of each detection probe through 2N signal conditioning circuits, and performs intelligent processing to obtain 2N displacement components, each displacement component is generated by the magnetic pump shaft The axial center passes through the cylindrical magnetic field of the corresponding detection probe to generate the radial displacement component of the detection wheel in the radial direction of the center of the body.

B. In order to reduce the influence of axial series movement or inclination of the magnetic pump shaft, the intelligent magnetic pump shaft position online monitoring circuit board respectively adds the displacement components of the detection wheel obtained by the two detection probes on both sides of the detection wheel in the same radial direction , to obtain the sum displacement components of the detection wheel in each radial direction.

C. The on-line monitoring circuit board for the position of the rotating shaft of the intelligent magnetic pump performs the corresponding coordinate transformation processing and difference calculation processing on the sum displacement component of the detection wheel in each radial direction, and obtains the detection in the orthogonal X-axis and Y-axis directions. The component of the wheel displacement, and then through calculation and scale transformation, the actual radial displacement of the magnetic pump shaft is obtained.

In the invention, the detection device is fixed on the non-rotating body of the magnetic pump, the magnetic pump shaft position sensor is composed of the detection wheel and 2N detection probes, and the position state of the magnetic pump shaft is detected online through the intelligent magnetic pump shaft position online monitoring circuit board, which can Timely forecast and discover the friction between the inner rotor of the magnetic pump and the isolation sleeve of the magnetic pump to avoid leakage accidents. The structure of the device is simple, and the monitoring method is accurate and reliable.

Above-mentioned magnetic pump rotating shaft position on-line monitoring device, its detection probe also can be made of magnetizer 5 (40), magnetizer 3 (27), magnetizer 4 (28), magnetic field generator (42), magnetic field sensitive body ( 43), non-magnetic conductive support 2 (41) constitutes;

The magnetic conductor 4 is inserted from the right side of the magnetic conductor 3, the long rectangular side of the rectangular column body of the magnetic conductor 4 is parallel to the long rectangular side of the rectangular column-shaped body of the magnetic conductor 3, and the non-magnetic conductive bracket is inserted from the left side of the magnetic conductor 3. On the magnetizer 4 cylindrical bodies, the right end face of the magnetizer 4 is coplanar with the right end face of the magnetizer 3 . The magnetic field sensitive body 2 is a ring-column coil, which is set on the non-magnetic support and offsets the two rectangular-shaped bodies of the magnetizer 4. The magnetic field generator 2 is a ring-shaped coil, which is set on the non-magnetic support. The magnetic field sensitive body 2 offsets, and the magnetic conductor 5 garden cylindrical body inserts the non-magnetic conductor bracket central circular hole from the magnetizer 3 left side before, and offsets with the magnetizer 4.

The corresponding intelligent magnetic pump shaft position online monitoring circuit board is composed of a sine signal generator, 2N signal conditioning circuits and intelligent signal processing circuits. The ports are connected, and the signal output lines of the 2N signal conditioning circuits are all connected to the 2N input ports of the intelligent signal processing circuit;

The sinusoidal signal generator provides magnetic field excitation signals for 2N magnetic field generators (42) at the same time.

The on-line monitoring device for the position of the rotating shaft of the magnetic pump of the present invention can also adopt a unilateral detection probe scheme: the on-line monitoring device for the position of the rotating shaft of the magnetic pump includes a magnetic pump isolation sleeve (1), 2N detection probes (17), and a detection probe cover (18 ), detection wheel (19), inner magnetic rotor (3), inner sliding bearing support (10), left detection probe outlet pipe (11), intelligent magnetic pump shaft position online monitoring circuit board (39).

The detection probe structure is the same as before.

The 2N detection probes are all fixed on the isolation sleeve of the magnetic pump.

The 2N detection probes are divided into two groups and fixed in the magnetic pump isolating ring-shaped slot from the right side. The distance between the center of the cylindrical magnetic field generating body of each group of N detection probes and the axis of the magnetic pump shaft is equal. The rectangular long sides of the magnetizer 4 of the detection probe are respectively parallel to the radial rays of the magnetic pump axis passing through the center of the cylindrical magnetic field generating body of the detection probe.

The distance between the center of the cylindrical magnetic field generating body of the first group of N detection probes and the axis of the magnetic pump shaft is greater than or equal to the distance between the center of the cylindrical magnetic field generating body of the second group of N detection probes and the axis of the magnetic pump shaft plus the detection probe The length of the rectangular long side of the magnetizer 4 rectangular column type body;

The center of the cylindrical magnetic field of the second group of N detection probes is respectively on the connection line between the center of the cylindrical magnetic field of the first group of N detection probes and the axis of the magnetic pump shaft;

N is greater than or equal to 2; when N is equal to 2, the opening angle of the center of the detection probe cylindrical magnetic field generating body in the first group and the second group to the magnetic pump axis is 90 degrees; when N is greater than 2, the first group and the second group of detection probes are uniformly distributed along the circumferential direction, and the opening angles between adjacent detection probes of the same group are equal.

The ring-shaped non-magnetic detection probe cover (18) is covered on the ring-shaped embedding groove, welded and connected, the detection probe outlet pipe (11) is connected with the outlet hole in the embedding groove, the detection probe outlet pipe, 2N detection probes, magnetic force The pump isolation sleeve and the detection probe cover form an integrated structure.

The radius difference between the inner and outer circles of the detection wheel is greater than or equal to twice the moment length of the 3-square column of the detection probe magnetizer, and the radius of the outer ring of the detection wheel is equal to the center of the cylindrical magnetic field generating body of the first group of detection probes and the axis of the magnetic pump shaft distance.

The corresponding on-line monitoring method of the rotating shaft position of the magnetic drive pump is characterized in that it comprises the following steps:

A. When the bearing of the magnetic pump wears, the detection wheel fixed on the magnetic rotor in the magnetic pump produces a radial displacement, and the magnetic pump isolates the closed magnetic circuit composed of the first group of N detection probes and the detection wheel in the collar-shaped slot. The magnetic resistance changes at the same time, the overlapping area between the detection wheel and the second group of N detection probes remains unchanged, and the magnetic resistance of the closed magnetic circuit composed of the second group of N detection probes and the detection wheel is only the same as the distance between the detection probe and the detection wheel. It is related to the distance in the axial direction between them, but has nothing to do with the radial displacement of the detection wheel;

B. In order to reduce the influence of the axial series motion or inclination of the magnetic pump shaft, the corresponding magnetic field sensitive body of each detection probe generates a response signal, and the intelligent signal processing circuit board receives the response signal of the magnetic field sensitive body of each detection probe through 2N signal conditioning circuits , and carry out intelligent processing to obtain N displacement components, and each displacement component is a detection wheel displacement component in the radial direction of the center of the center of the circle generated by the magnetic pump shaft axis through the first set of corresponding detection probe cylindrical magnetic field, Its size is the response signal component of the magnetic field sensitive body of the first group of corresponding detection probes divided by the response signal component of the magnetic field sensitive body of the second group of detection probes in the corresponding radial direction, to obtain the displacement component in the radial direction;

C. The online monitoring circuit board of the rotating shaft position of the intelligent magnetic pump performs the corresponding coordinate transformation processing and difference calculation processing on the displacement components of the detection wheel in each radial direction, and obtains the detection wheel in the orthogonal X-axis and Y-axis directions. The displacement component, and then through calculation and scale transformation, the actual radial displacement displacement of the magnetic pump shaft is obtained.

Description of drawings

Figure 1. Schematic diagram of the structure of the on-line monitoring device for the position of the rotating shaft of the magnetic pump;

Figure 2. Schematic diagram of a partially enlarged structure of the on-line monitoring device for the position of the rotating shaft of the magnetic pump;

Figure 3. The cover of the non-magnetic ring detection probe;

Figure 4. Schematic diagram of the structure of the detection probe in the spacer sleeve and the ring-shaped slot of the inner sliding bearing bracket;

Figure 5. Structural diagram of magnetizer 1: a is the main view, b is the left view

Figure 6. Structural diagram of the magnetizer 3: where a is the main view, and b is the left view;

Figure 7. Structural diagram of the magnetizer 4: where a is the main view, and b is the left view;

Figure 8. The structural diagram of the non-magnetic bracket in the detection probe: where a is the main view and b is the left view;

Figure 9. Structural diagram of the detection probe: where a is the main view and b is the left view;

Figure 10. Example 1: When N is equal to 4, the position distribution diagram of detection probes, where a is the distribution of detection probes in the ring-shaped slot viewed from the left side of the magnetic pump spacer, and b is the ring shape viewed from the right side of the inner sliding bearing bracket Distribution of detection probes in the slot;

Figure 11. Example 2: When N is equal to 6, the position distribution diagram of detection probes, where a is the distribution of detection probes in the ring-shaped slot viewed from the left side of the magnetic pump spacer, and b is the ring shape viewed from the right side of the inner sliding bearing bracket Distribution of detection probes in the slot;

Figure 12. Embodiment 1: Closed magnetic circuit diagram of left and right detection probes and detection wheels;

Figure 13. Embodiment 1: Schematic diagram of signal conditioning circuit;

Figure 14. Embodiment 3: Structural diagram of the inner magnetic conductor 5 of the detection probe: a is the main view, and b is the left view;

Figure 15. Embodiment 3: Structural diagram of the non-magnetically conductive bracket 2 in the detection probe: a is the main view, and b is the left view;

Figure 16. Embodiment 3: Structural diagram of the detection probe: a is the main view, and b is the left view;

Figure 17. Embodiment 4: When N is equal to 4, the detection probe position distribution diagram;

Figure 18. Embodiment 4: Schematic diagram of the structure of the detection probe in the isolation collar-shaped groove;

In the figure: 1. Magnetic pump isolation sleeve, 2. Outer magnetic rotor, 3. Inner magnetic rotor, 4. Sliding bearing, 5. Pump casing, 6. Magnetic steel, 7. Impeller, 8. Motor, 9. Connecting frame, 10. Inner sliding bearing bracket, 11. Left detection probe outlet pipe, 12. Right detection probe outlet pipe, 13. Motor shaft, 14. Magnetic pump shaft, 15. Seal ring, 16. Non-magnetic support, 17. Detection probe , 18. Detection probe cover, 19. Detection wheel, 21. Linear Hall integrated circuit power supply pin, 22. Linear Hall integrated circuit output pin, 23. Linear Hall integrated circuit ground pin, 24. Signal conditioning circuit output pin , 25. Magnetic conductor 1, 26. Magnetic conductor 2, 27. Magnetic conductor 3, 28. Magnetic conductor 4, 29. Magnetic field generator, 30. Magnetic field sensitive body, 31. Detection probe M1, 32. Detection probe M2, 33 . Detection probe M3, 34. Detection probe M4, 35. Detection probe M5, 36. Detection probe M6, 37. Detection probe M7, 38. Detection probe M8, 39. Intelligent magnetic pump shaft position online monitoring circuit board, 40. Guide Magnet 5, 41. Non-magnetic conductive support, 42. Magnetic field generating body 2, 43. Magnetic field sensitive body 2.

detailed description

Example 1

Referring to Figures 1 to 9, the magnetic pump consists of a magnetic pump spacer (1), an outer magnetic rotor (2), an inner magnetic rotor (3), front and rear sliding bearings (4), a pump casing (5), and a magnetic steel (6) , impeller (7), motor (8), connecting frame (9), inner sliding bearing bracket (10), motor shaft (13), magnetic pump shaft (14), sealing ring (15), the position of the magnetic pump shaft is online The monitoring device includes 2N detection probes (17), 2 detection probe covers (18), detection wheel (19), left detection probe outlet pipe (11), right detection probe outlet pipe (12) and intelligent magnetic pump shaft position On-line monitoring of the circuit board (39).

As shown in Figure 4, the inner, outer diameter and depth of the ring-shaped slot on the magnetic pump spacer and the ring-shaped slot on the inner sliding bearing bracket have the same geometric dimensions, and are coaxial with the magnetic pump shaft.

2N detection probes are fixed on the magnetic pump isolation sleeve and the inner sliding bearing bracket, N is equal to 4, of which N detection probes are fixed in the magnetic pump isolation sleeve ring-shaped slot from the right, and are detected by a ring-shaped non-magnetic The probe cover (18) is covered in the notch of the magnetic pump isolation collar-type embedding groove, welded and connected, the left detection probe outlet pipe (11) is connected with the outlet hole in the isolation collar-type embedding groove, the left detection probe outlet pipe, N pieces The detection probe, the isolation sleeve of the magnetic pump, and the detection probe cover form an integrated structure;

In addition, N detection probes are fixed in the ring-shaped groove of the inner sliding bearing bracket from the left side, and are covered by another ring-shaped non-magnetic detection probe cover (18) on the ring-shaped groove of the inner sliding bearing bracket, welded Connection, the right detection probe outlet pipe (12) is connected with the inner outlet hole of the inner sliding bearing bracket ring-shaped embedded groove, the right detection probe outlet pipe, N detection probes, inner sliding bearing bracket, and detection probe cover also form an integrated structure;

The inner magnetic rotor is fixed on the magnetic pump shaft, and the ring-shaped detection wheel (19) made of magnetically conductive material is fitted on the inner magnetic rotor from the right side. The detection wheel is coaxial with the magnetic pump shaft, and its left end face is aligned with the left detection probe The distance between the right end face of the cover is equal to the distance between the right end face and the left end face of the right detection probe cover;

As shown in Figure 9, the detection probe comprises a magnetic conductor 1 (25), a magnetic conductor 2 (26), a magnetic conductor 3 (27), a magnetic conductor 4 (28), a magnetic field generator (29), a magnetic field sensitive body (30) , non-magnetic conductive support (16);

The magnetic conductor 4 is inserted from the right side of the magnetic conductor 3, the long rectangular side of the rectangular column body of the magnetic conductor 4 is parallel to the long rectangular side of the rectangular column-shaped body of the magnetic conductor 3, and the non-magnetic conductive bracket is inserted from the left side of the magnetic conductor 3. On the magnetizer 4 cylindrical bodies, the right end face of the magnetizer 4 is coplanar with the right end face of the magnetizer 3 .

The magnetic field sensitive body is inserted from the left side of the center hole of the non-magnetic bracket to offset the magnetizer 4, and the magnetizer 2 is inserted from the left side of the center hole of the non-magnetic bracket and offset against the left end surface of the inner boss, and the magnetic field generator is inserted from the non-magnetic bracket The central round hole on the left side of the bracket is inserted into the center hole of the magnetizer 2 to offset the magnetizer 1. The cylindrical body is inserted into the center hole of the non-magnetic bracket from the left side of the magnetizer 3 and offset with the magnetic field generator;

The center of the cylindrical magnetic field generating body of the 2N detection probes is equal to the distance from the center of the magnetic pump shaft, and the rectangular long sides of the 4-column body of the magnetizer of each detection probe are respectively connected to the cylindrical magnetic field generating body of the detection probe. The radial rays of the magnetic pump axis of the heart are parallel;

As shown in Figure 10, when N is equal to 4, the opening angle of the cylindrical magnetic field generating body of the adjacent detection probe on the same side of the detection wheel to the magnetic pump axis is 90 degrees;

The detection probes on both sides of the detection wheel are mirror-symmetrically distributed to the center plane of the detection wheel. The radius difference between the inner and outer circles of the detection wheel is equal to the moment length of the magnetic conductor of the detection probe. The radius of the outer ring of the detection wheel is equal to the cylindrical magnetic field of the detection probe. Generate the distance between the center of the body and the axis of the magnetic pump shaft;

As shown in Figure 12, the magnetizer 1, the magnetic field generator, the magnetizer 2, the magnetic field sensitive body, the magnetizer 3, the magnetizer 4 and the detection wheel in each detection probe form a closed magnetic circuit respectively, and the magnetic field generator (29) is Permanent magnet, axially magnetized, magnetic field sensitive body (30) is a linear Hall integrated circuit CS3503, magnetizer (25), magnetizer 2 (26), magnetizer 3 (27), magnetizer 4 (28) are made of pure Made of iron.

The online monitoring circuit board for the position of the rotating shaft of the intelligent magnetic pump is composed of 2N signal conditioning circuits and intelligent signal processing circuits. The signal output lines are all connected to 2N input ports of the intelligent signal processing circuit;

Figure 13 is a signal conditioning circuit, the linear Hall integrated circuit power pin (21) is connected to the power supply VCC, the linear Hall integrated circuit ground pin (23) is grounded, and the linear Hall integrated circuit output pin (22) is a magnetic field sensitive response signal pin , connected to the signal input port of one signal conditioning circuit in the on-line monitoring circuit board for the position of the rotating shaft of the intelligent magnetic pump, and the output line (24) of the signal conditioning circuit is connected to an input port of the intelligent signal processing circuit.

The online monitoring circuit board program of the intelligent magnetic pump shaft position completes the following tasks:

A. When the bearing of the magnetic pump is worn, the detection wheel fixed on the magnetic rotor in the magnetic pump produces a radial displacement, and the magnetic resistance of the closed magnetic circuit composed of each detection probe and the detection wheel changes at the same time;

It can be seen from Fig. 9 that the air gap between the rectangular area of the detection probe magnetizer 4 and the two rectangular areas of the magnetizer 3 and the overlapping area of the detection probe is a part of the closed magnetic circuit of the detection probe. The increase or decrease of the overlapping area of the detection wheel is a linear function of the moving distance of the detection wheel in this direction component, and corresponding to the moving distance of the detection wheel in this direction component, the reluctance of the closed magnetic circuit of the detection probe increases or decreases linearly.

As shown in Figure 4, Figure 10, and Figure 12, when the detection wheel moves a distance along the positive Y direction, the overlapping area of the detection wheel, the detection probe 31 and the detection probe 35 increases, and the closed magnetic circuit of the detection probe 31 and the detection probe 35 The reluctance of the detection wheel increases linearly, and at the same time, the overlapping area of the detection wheel and the detection probe 33 and the detection probe 37 decreases, and the reluctance of the closed magnetic circuit of the detection probe 33 and the detection probe 37 decreases linearly.

B. The corresponding magnetic field sensitive body of each detection probe generates a response signal, and the intelligent signal processing circuit board receives the response signal of the magnetic field sensitive body of each detection probe through 2N signal conditioning circuits, and performs intelligent processing to obtain 2N displacement components, each displacement The quantity component is the detection wheel displacement component in the radial direction of the center of the body garden produced by the axis of the magnetic pump shaft through the corresponding detection probe cylindrical magnetic field;

C. The online monitoring circuit board of the rotating shaft position of the intelligent magnetic pump adds the displacement components of the detection wheel obtained by the two detection probes on both sides of the detection wheel in the same radial direction to obtain the sum displacement components of the detection wheel in each radial direction ;

As shown in Figure 10: Add the detection wheel displacement components on the detection probe M1 (31) and the detection probe M5 (35) to obtain the detection wheel displacement component Y+ in the positive Y-axis direction, and the detection probe M3 (33) and The detection wheel displacement components on the detection probe M7 (37) are added to obtain the detection wheel displacement component Y- in the negative Y-axis direction, and the detection wheel displacements on the detection probe M4 (34) and detection probe M6 (36) The components of the displacement are added together to obtain the detection wheel displacement component X+ in the positive X-axis direction, and the detection wheel displacement components on the detection probe M8 (38) and detection probe M2 (32) are added to obtain the displacement component X+ in the negative X-axis direction. Detect the wheel displacement component X-.

D. The on-line monitoring circuit board for the position of the rotating shaft of the intelligent magnetic pump performs the corresponding coordinate transformation processing and difference calculation processing on the sum displacement component of the detection wheel in each radial direction, and obtains the detection in the orthogonal X-axis and Y-axis directions The wheel displacement component, and then through calculation and scale transformation, the radial displacement displacement V of the magnetic pump shaft is obtained.

$\mathrm{<span\; class="notranslate">\; V</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; k</span>}\sqrt{{<span\; class="notranslate">\; [</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; x</span>}<span\; class="notranslate">\; +</span><span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; x</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; )</span><span\; class="notranslate">\; ]</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; [</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Y</span>}<span\; class="notranslate">\; +</span><span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Y</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; )</span><span\; class="notranslate">\; ]</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}$

Where k is the scale transformation coefficient.

Example 2

Embodiment 2 On the basis of Embodiment 1, N is changed to 6, and the rest remain unchanged. Referring to FIG. 11 , the detection probe position distribution diagram when N is equal to 6.

Example 3

Embodiment 3 On the basis of embodiment 1, the detection probe is changed into a magnetic conductor 5 (40), a magnetic conductor 3 (27), a magnetic conductor 4 (28), a magnetic field generator (42), a magnetic field sensitive body (43), Non-magnetic support 2 (41) constitutes;

The structure of the inner magnetizer 5 of the detection probe is shown in Figure 14: a is the main view, and b is the left view.

The structure of the non-magnetically conductive bracket 2 in the detection probe is shown in Figure 15: a is the front view, and b is the left view.

The magnetic field generating body (42) and the magnetic field sensitive body (43) are two ring-column coils respectively.

The magnetic conductor 4 is inserted from the right side of the magnetic conductor 3, the long rectangular side of the rectangular column body of the magnetic conductor 4 is parallel to the long rectangular side of the rectangular column-shaped body of the magnetic conductor 3, and the non-magnetic conductive bracket is inserted from the left side of the magnetic conductor 3. On the magnetizer 4 cylindrical bodies, the right end face of the magnetizer 4 is coplanar with the right end face of the magnetizer 3 . The magnetic field sensitive body 2 is a ring-column coil, which is set on the non-magnetic support and offsets the two rectangular-shaped bodies of the magnetizer 4. The magnetic field generator 2 is a ring-shaped coil, which is set on the non-magnetic support. The magnetic field sensitive body 2 offsets, and the magnetic conductor 5 garden cylindrical body inserts the non-magnetic conductive support center circular hole from the left side of the magnetic conductor 3 at the front, and offsets with the magnetic conductor 4;

Correspondingly, a sinusoidal signal generator is added to the on-line monitoring circuit board for the position of the rotating shaft of the intelligent magnetic pump and simultaneously provides magnetic field excitation signals for 2N magnetic field generators (42).

The two signal ends of the magnetic field generator 2 are respectively connected to pins 22 and 23 of the signal conditioning circuit shown in FIG. 13 .

Example 4

The on-line monitoring device for the position of the magnetic pump shaft of the present invention can also adopt a unilateral detection technical solution: the on-line monitoring device for the position of the magnetic pump shaft includes a magnetic pump isolation sleeve (1), 2N detection probes (17), and a detection probe cover ( 18), detection wheel (19), inner magnetic rotor (3), inner sliding bearing bracket (10), left detection probe outlet pipe (11), intelligent magnetic pump shaft position online monitoring circuit board (39), where N is equal to 4 .

On the basis of Example 1, the detection probe on the inner sliding bearing bracket is also moved to the magnetic pump isolation sleeve, and the installation method is the same. The 2N detection probes are divided into two groups and fixed on the magnetic pump isolation sleeve from the right side. In the groove, as shown in Figure 17 and Figure 18, the distance between the center of the cylindrical magnetic field generating body of the first group of N detection probes and the axis of the magnetic pump shaft is greater than or equal to the center of the cylindrical magnetic field generating body of the second group of N detection probes Add the length of the rectangular long side of the 4-square column body of the magnetizer of the detection probe to the distance from the axis of the magnetic pump shaft; Connection, the detection probe outlet pipe (11) is connected with the outlet hole in the embedded groove, the detection probe outlet pipe, 2N detection probes, magnetic pump isolation sleeves, and the detection probe cover form an integrated structure.

The corresponding on-line monitoring method of the rotating shaft position of the magnetic drive pump is characterized in that it comprises the following steps:

A. When the bearing of the magnetic pump wears, the detection wheel fixed on the magnetic rotor in the magnetic pump produces a radial displacement, and the magnetic pump isolates the closed magnetic circuit composed of the first group of N detection probes and the detection wheel in the collar-shaped slot. The magnetic resistance changes at the same time, and the magnetic resistance of the closed magnetic circuit composed of the second group of N detection probes and the detection wheel does not change;

B. The corresponding magnetic field sensitive body of each detection probe generates a response signal, and the intelligent signal processing circuit board receives the response signal of the magnetic field sensitive body of each detection probe through 2N signal conditioning circuits, and performs intelligent processing to obtain N displacement components, each displacement The quantity component is the displacement component of the detection wheel in the radial direction of the center of the cylindrical magnetic field of the first group of corresponding detection probes through the axis of the magnetic pump shaft, and its magnitude is the response signal of the first group of corresponding detection probes. divided by the response signal of the magnetic field sensitive body of the second group of corresponding detection probes in the corresponding radial direction;

C. The online monitoring circuit board of the rotating shaft position of the intelligent magnetic pump performs the corresponding coordinate transformation processing and difference calculation processing on the displacement components of the detection wheel in each radial direction, and obtains the detection wheel in the orthogonal X-axis and Y-axis directions. The displacement component, and then through calculation and scale transformation, the radial displacement displacement of the magnetic pump shaft is obtained.

Claims (3)

1. A magnetic pump rotating shaft position on-line monitoring device, comprising a magnetic pump rotating shaft position on-line monitoring device comprising a magnetic pump isolation cover (1), 2N detection probes (17), 2 detection probe covers (18), detection wheels ( 19), inner magnetic rotor (3), inner sliding bearing bracket (10), left detection probe outlet pipe (11), right detection probe outlet pipe (12) and intelligent magnetic pump shaft position online monitoring circuit board (39); It is characterized in that: the inner and outer diameters and depths of the ring-shaped slot on the magnetic pump spacer and the ring-shaped slot on the inner sliding bearing bracket are the same, and they are coaxial with the magnetic pump shaft; 2N detection probes are fixed on the isolation sleeve of the magnetic pump and the inner sliding bearing bracket; Among them, N detection probes are fixed in the magnetic pump isolating ring-shaped slot from the right side, and a ring-shaped non-magnetic detection probe cover (18) is covered on the notch of the magnetic pump isolating ring-shaped slot, welded and connected , the left detection probe outlet pipe (11) is connected to the outlet hole in the isolation sleeve ring-type embedding groove, the left detection probe outlet pipe, N detection probes, magnetic pump isolation sleeves, and the detection probe cover form an integrated structure; In addition, N detection probes are fixed in the ring-shaped groove of the inner sliding bearing bracket from the left side, and are covered by another ring-shaped non-magnetic detection probe cover (18) on the ring-shaped groove of the inner sliding bearing bracket, welded Connection, the right detection probe outlet pipe (12) is connected with the inner outlet hole of the inner sliding bearing bracket ring-shaped embedded groove, the right detection probe outlet pipe, N detection probes, inner sliding bearing bracket, and detection probe cover also form an integrated structure; The inner magnetic rotor is fixed on the magnetic pump shaft, and the ring-shaped detection wheel (19) made of magnetically conductive material is fitted on the inner magnetic rotor from the right side. The detection wheel is coaxial with the magnetic pump shaft, and its left end face is aligned with the left detection probe The distance between the right end face of the cover is equal to the distance between the right end face and the left end face of the right detection probe cover; The detection probe comprises a magnetometer 1 (25), a magnetometer 2 (26), a magnetometer 3 (27), a magnetometer 4 (28), a magnetic field generator (29), a magnetic field sensitive body (30), a non-magnetic bracket ( 16); The magnetic conductor 4 is inserted from the right side of the magnetic conductor 3, the long rectangular side of the rectangular column body of the magnetic conductor 4 is parallel to the long rectangular side of the rectangular column-shaped body of the magnetic conductor 3, and the non-magnetic conductive bracket is inserted from the left side of the magnetic conductor 3. On the magnetizer 4 cylindrical bodies, the right end face of the magnetizer 4 is coplanar with the right end face of the magnetizer 3 . The magnetic field sensitive body is inserted from the left side of the center hole of the non-magnetic bracket to offset the magnetizer 4, and the magnetizer 2 is inserted from the left side of the center hole of the non-magnetic bracket and offset against the left end surface of the inner boss, and the magnetic field generator is inserted from the non-magnetic bracket The central round hole on the left side of the bracket is inserted into the center hole of the magnetizer 2 to offset the magnetizer 1. The cylindrical body is inserted into the center hole of the non-magnetic bracket from the left side of the magnetizer 3 and offset with the magnetic field generator; The center of the cylindrical magnetic field generating body of the 2N detection probes is equal to the distance from the center of the magnetic pump shaft, and the rectangular long sides of the 4-column body of the magnetizer of each detection probe are respectively connected to the cylindrical magnetic field generating body of the detection probe. The radial rays of the magnetic pump axis of the heart are parallel; N is greater than or equal to 2; when N is equal to 2, the center of the cylindrical magnetic field generating body of the two detection probes on the same side of the detection wheel has an opening angle of 90 degrees to the axis of the magnetic pump; when N is greater than 2, the detection probes on the same side of the detection wheel Evenly distributed along the circumferential direction, the opening angles between adjacent detection probes are equal; The detection probes on both sides of the detection wheel are mirror-symmetrically distributed to the center plane of the detection wheel, the radius difference between the inner and outer circles of the detection wheel is greater than or equal to the moment length of the magnetic conductor of the detection probe, and the radius of the outer ring of the detection wheel is equal to the cylindrical shape of the detection probe. The distance between the center of the magnetic field generating body and the axis of the magnetic pump shaft; The magnetic conductor 1, the magnetic field generator, the magnetic conductor 2, the magnetic field sensitive body, the magnetic conductor 3, the magnetic conductor 4 and the detection wheel in each detection probe respectively form a closed magnetic circuit; The online monitoring circuit board for the position of the rotating shaft of the intelligent magnetic pump is composed of 2N signal conditioning circuits and intelligent signal processing circuits. The signal output lines are all connected to 2N input ports of the intelligent signal processing circuit; The online monitoring method of the rotating shaft position of the magnetic pump is characterized in that it includes the following steps: A. When the bearing of the magnetic pump is worn, the detection wheel fixed on the magnetic rotor in the magnetic pump produces a radial displacement, and the magnetic resistance of the closed magnetic circuit composed of each detection probe and the detection wheel changes at the same time; B. The corresponding magnetic field sensitive body of each detection probe generates a response signal, and the intelligent signal processing circuit board receives the response signal of the magnetic field sensitive body of each detection probe through 2N signal conditioning circuits, and performs intelligent processing to obtain 2N displacement components, each displacement The quantity component is the detection wheel displacement component in the radial direction of the center of the body garden produced by the axis of the magnetic pump shaft through the corresponding detection probe cylindrical magnetic field; C. The online monitoring circuit board of the rotating shaft position of the intelligent magnetic pump adds the displacement components of the detection wheel obtained by the two detection probes on both sides of the detection wheel in the same radial direction to obtain the sum displacement components of the detection wheel in each radial direction ; D. The on-line monitoring circuit board for the position of the rotating shaft of the intelligent magnetic pump performs the corresponding coordinate transformation processing and difference calculation processing on the sum displacement component of the detection wheel in each radial direction, and obtains the detection in the orthogonal X-axis and Y-axis directions The component of the wheel displacement, and then through calculation and scale transformation, the radial displacement of the magnetic pump shaft is obtained. 2. a kind of magnetic pump rotating shaft position on-line monitoring device as claimed in claim 1, its detection probe also can be made of magnetic conductor 5 (40), magnetic conductor 3 (27), magnetic conductor 4 (28), magnetic field generator (42) , a magnetic field sensitive body (43), and a non-magnetically conductive support 2 (41); Its characteristics are: the magnetizer 4 is inserted from the right side of the magnetizer 3, the long rectangular side of the rectangular column shape of the magnetizer 4 is parallel to the long rectangular side of the magnetizer 3 rectangular column shape, and the non-magnetic guide bracket is inserted from the left side of the magnetizer 3. The side inserts and is sleeved on the magnetic conductor 4 cylindrical bodies, and the right end surface of the magnetic conductor 4 is coplanar with the right end surface of the magnetic conductor 3 . The magnetic field sensitive body 2 is a ring-column coil, which is set on the non-magnetic support and offsets the two rectangular-shaped bodies of the magnetizer 4. The magnetic field generator 2 is a ring-shaped coil, which is set on the non-magnetic support. The magnetic field sensitive body 2 offsets, and the magnetic conductor 5 garden cylindrical body inserts the non-magnetic conductive support center circular hole from the left side of the magnetic conductor 3 at the front, and offsets with the magnetic conductor 4; Correspondingly, a sinusoidal signal generator is added to the on-line monitoring circuit board for the position of the rotating shaft of the intelligent magnetic pump and simultaneously provides magnetic field excitation signals for 2N magnetic field generators (42). 3. An online monitoring device for the position of a magnetic pump shaft as claimed in claim 1 may also adopt a unilateral detection technical solution: The online monitoring device for the rotating shaft position of the magnetic pump includes a magnetic pump isolation sleeve (1), 2N detection probes (17), a detection probe cover (18), a detection wheel (19), an inner magnetic rotor (3), and an inner sliding bearing Bracket (10), left detection probe outlet pipe (11), on-line monitoring circuit board (39) for the position of the rotating shaft of the intelligent magnetic pump; The detection probe structure is the same as before; 2N detection probes are all fixed on the isolation sleeve of the magnetic pump; The 2N detection probes are divided into two groups and fixed in the magnetic pump isolating ring-shaped slot from the right side. The distance between the center of the cylindrical magnetic field generating body of each group of N detection probes and the axis of the magnetic pump shaft is equal. The rectangular long sides of the magnetizer 4 rectangular column body of the detection probe are respectively parallel to the radial rays of the magnetic pump shaft passing through the cylindrical magnetic field of the detection probe; The distance between the center of the cylindrical magnetic field generating body of the first group of N detection probes and the axis of the magnetic pump shaft is greater than or equal to the distance between the center of the cylindrical magnetic field generating body of the second group of N detection probes and the axis of the magnetic pump shaft plus the detection probe The length of the rectangular long side of the magnetizer 4 rectangular column type body; The center of the cylindrical magnetic field of the second group of N detection probes is respectively on the connection line between the center of the cylindrical magnetic field of the first group of N detection probes and the axis of the magnetic pump shaft; N is greater than or equal to 2; when N is equal to 2, the opening angle of the center of the cylindrical magnetic field generating body of the first group and the second group of detection probes to the axis of the magnetic pump is 90 degrees; when N is greater than 2, the first group and the second group A group of detection probes is evenly distributed along the circumference, and the opening angles between adjacent detection probes in the same group are equal; The ring-shaped non-magnetic detection probe cover (18) is covered on the ring-shaped embedding groove, welded and connected, the detection probe outlet pipe (11) is connected with the outlet hole in the embedding groove, the detection probe outlet pipe, 2N detection probes, magnetic force The pump isolation sleeve and the detection probe cover form an integrated structure; The radius difference between the inner and outer circles of the detection wheel is greater than or equal to twice the moment length of the 3-square column of the detection probe magnetizer, and the radius of the outer ring of the detection wheel is equal to the center of the cylindrical magnetic field generating body of the first group of detection probes and the axis of the magnetic pump shaft distance; The corresponding online monitoring method for the position of the rotating shaft of the magnetic drive pump: its characteristics include the following steps: A. When the bearing of the magnetic pump wears, the detection wheel fixed on the magnetic rotor in the magnetic pump produces a radial displacement, and the magnetic pump isolates the closed magnetic circuit composed of the first group of N detection probes and the detection wheel in the collar-shaped slot. The magnetic resistance changes at the same time, the overlapping area between the detection wheel and the second group of N detection probes remains unchanged, and the magnetic resistance of the closed magnetic circuit composed of the second group of N detection probes and the detection wheel is only the same as the distance between the detection probe and the detection wheel. It is related to the distance in the axial direction between them, but has nothing to do with the radial displacement of the detection wheel; B. The corresponding magnetic field sensitive body of each detection probe generates a response signal, and the intelligent signal processing circuit board receives the response signal of the magnetic field sensitive body of each detection probe through 2N signal conditioning circuits, and performs intelligent processing to obtain N displacement components, each displacement The quantity component is the displacement component of the detection wheel in the radial direction of the center of the cylindrical magnetic field of the first group of corresponding detection probes through the axis of the magnetic pump shaft, and its magnitude is the response signal of the first group of corresponding detection probes. The component is divided by the response signal component of the magnetic field sensitive body of the second group of detection probes in the corresponding radial direction to obtain the displacement component in the radial direction; C. The online monitoring circuit board of the rotating shaft position of the intelligent magnetic pump performs the corresponding coordinate transformation processing and difference calculation processing on the displacement components of the detection wheel in each radial direction, and obtains the detection wheel in the orthogonal X-axis and Y-axis directions. The displacement component, and then through calculation and scale transformation, the actual radial displacement displacement of the magnetic pump shaft is obtained.