CN110863992A - Magnetic rotor offset monitoring device in magnetic pump and magnetic pump - Google Patents

Abstract

The magnetic pump inner magnetic rotor offset monitoring device and the magnetic force pump of the present invention are composed of a first inner permanent magnet (61a) and a second inner permanent magnet (61b) which are symmetrically and fixedly installed on the center line on the side end of the inner magnetic rotor (6). , the first coil (71a) and the second coil (71b) are symmetrically fixed on the centerline of the outer circular surface of the isolation sleeve (7), and the transmitter (9) placed outside the magnetic pump constitutes the inner magnetic rotor of the magnetic pump Offset monitoring device; the magnetic strength of the first inner permanent magnet and the second inner permanent magnet are the same; the coil parameters of the first coil and the second coil are the same; the first coil and the second coil are connected in series with opposite phases through the transmission wire and placed in the magnetic force The transmitter outside the pump is connected, and the induced electromotive force or induced current is compared and processed by the transmitter, so as to monitor the deviation of the main system of the magnetic pump in real time, and perform local display and remote control.

Description

Magnetic rotor offset monitoring device in magnetic pump and magnetic pump

technical field

The invention relates to a magnetic pump, in particular to an internal magnetic rotor offset monitoring device of the magnetic pump.

Background technique

During the operation of the magnetic pump, the following situations will cause friction damage between the inner magnetic rotor and the inner wall of the isolation sleeve, resulting in a breakdown:

1. The sliding bearing material is made of soft materials such as graphite. After running for a certain period of time, the clearance between the sliding bearing and the bushing is too large. If it is not replaced in time, the uneven force on the rotor system will cause the internal magnetic rotor when the operating conditions change. Friction damage with the inner wall of the isolation sleeve.

2. When sliding bearings or bushings are made of hard materials such as SiC, due to the brittleness of the material itself, brittle cracks occur during operation, which will cause the rotor system to shift. If it is not found in time, friction between the inner magnetic rotor and the inner wall of the isolation sleeve will occur. damage.

3. The magnetic force distribution of the magnetic steel installed on the inner and outer magnetic rotors is uneven, and as the running time increases, it will cause uneven force on the rotor system and accelerate the bearing wear. If it is not found in time, it will cause friction damage between the inner magnetic rotor and the inner wall of the isolation sleeve.

4. Other uncertain factors.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a magnetic pump internal magnetic rotor offset monitoring device and a magnetic pump using the internal magnetic rotor offset monitoring device, so as to monitor the rotor system offset in real time and prevent the internal magnetic rotor from being separated from the inner wall of the isolation sleeve. Friction occurs, safety accidents occur.

The magnetic pump inner magnetic rotor offset monitoring device of the present invention consists of a first inner permanent magnet and a second inner permanent magnet which are symmetrically and fixedly installed on the center line on the side end of the inner magnetic rotor, and are symmetrically and fixedly installed on the center of the outer circular surface of the isolation sleeve. The first coil and the second coil on the line are composed of a transmitter placed outside the magnetic pump;

The first coil 71a and the second coil 71b are flat wound coils, the outer parts of the coils are wrapped with insulating resin, and are pasted and fixed on the outer surface of the isolation sleeve 7 with high temperature resistant glue.

The volume, shape and magnetic strength of the first inner permanent magnet and the second inner permanent magnet are the same; the coil parameters of the first coil and the second coil are the same; the phase of the first coil and the second coil are opposite The series connection is connected with the transmitter placed outside the magnetic pump through the transmission wire, and the transmitter performs local display and remote transmission.

In the present invention, the first inner permanent magnet and the second inner permanent magnet are fixedly installed symmetrically (ie, 180°) on the center line on the side end of the inner magnetic rotor, and are fixedly installed symmetrically (ie, 180°) on the center line on the outer circular surface of the isolation sleeve. first coil and second coil. When the inner magnet rotor rotates, the first inner permanent magnet and the second inner permanent magnet on the inner magnet rotor correspond to the first coil and the second coil on the outer circular surface of the isolation sleeve in the radial direction. The first inner permanent magnet and the second inner permanent magnet on the inner magnetic rotor cut the first coil and the second coil on the outer surface of the isolation sleeve, and the first coil and the second coil respectively generate induced electromotive force (induced current) ), the first coil and the second coil are connected in series with opposite phases to the transmitter placed outside the magnetic pump through a transmission wire.

When the inner magnet rotor is not radially offset, that is, when the distances between the inner magnet rotor and the first and second inner permanent magnets on the inner magnet rotor and the spacer sleeve are equal, the first inner permanent magnet on the inner magnet rotor The distance between the second inner permanent magnet and the first coil and the second coil on the isolation sleeve is equal, and the first coil and the second coil are subjected to the induced electromotive force ( Induced current) is the same in magnitude and opposite in direction; since the first coil and the second coil are connected in opposite phases, the induced electromotive force (induced current) generated by the first coil and the second coil in opposite phase and series cancels each other out, and the output induced electromotive force (induction current) cancels each other out. current) is zero.

When the inner magnetic rotor is radially displaced, that is, when the distance between the inner magnetic rotor and the first and second inner permanent magnets on it and the spacer sleeve is displaced to one side in the radial direction, the inner magnetic rotor The distance between the first inner permanent magnet and the second inner permanent magnet on the spacer and the first coil and the second coil on the isolation sleeve is changed, that is, the distance between the first inner permanent magnet and the second inner permanent magnet and the first coil is changed. The distance and the distance between the first inner permanent magnet and the second inner permanent magnet and the second coil are larger and smaller; due to the different distances between the permanent magnet and the coil, the strength of the permanent magnet magnetic field line cutting coil is different, so that between the first coil and the coil The magnitude of the induced electromotive force (induced current) produced by the second coil is different, so the induced electromotive force (induced current) generated by the first coil and the second coil in series with opposite phases cannot completely cancel each other, and the output induced electromotive force (induced current) is greater than zero; The transmitter performs (filtering, amplifying) comparison processing on the induced electromotive force (induced current), so as to determine whether the radial offset and radial offset of the inner magnetic rotor occur, and perform local display and remote control, so as to control the magnetic pump. The deviation of the main shaft system is monitored in real time to prevent friction between the inner magnetic rotor and the inner wall of the isolation sleeve, resulting in safety accidents.

The magnetic pump with the internal magnetic rotor offset monitoring device of the present invention includes a pump body, a pump cover, a main shaft, a bearing device, an impeller, an internal magnetic rotor, a spacer sleeve, and an external magnetic rotor. The isolation casing is provided with a magnetic rotor offset monitoring device in the magnetic pump;

The magnetic pump inner magnetic rotor offset monitoring device consists of a first inner permanent magnet and a second inner permanent magnet which are symmetrically and fixedly installed on the centerline of the side end of the inner magnetic rotor, and symmetrically and fixedly installed on the centerline of the outer circular surface of the isolation sleeve. The first coil and the second coil are composed of transmitters placed outside the magnetic pump;

The volume, shape and magnetic strength of the first inner permanent magnet and the second inner permanent magnet are the same; the coil parameters of the first coil and the second coil are the same; the phase of the first coil and the second coil are opposite The series connection is connected with the transmitter placed outside the magnetic pump through the transmission wire for local display and remote transmission.

Description of drawings

FIG. 1 is a schematic structural diagram of an embodiment of a magnetic rotor offset monitoring device in a magnetic pump of the present invention.

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1 .

3 is a schematic structural diagram of an embodiment of a magnetic pump with an internal magnetic rotor offset monitoring device according to the present invention.

Detailed ways

The magnetic pump inner magnetic rotor offset monitoring device of the present invention consists of a first inner permanent magnet 61a and a second inner permanent magnet 61b which are symmetrically and fixedly installed on the center line of the side end of the inner magnetic rotor 6, and are symmetrically and fixedly installed outside the isolation sleeve 7 The first coil 71a and the second coil 71b on the center line of the circular surface are formed by the transmitter 9 placed outside the magnetic pump;

The volume, shape and magnetic strength of the first inner permanent magnet 61a and the second inner permanent magnet 61b are the same; the coil parameters of the first coil 71a and the second coil 71b are the same; the first coil 71a and the The second coil 71b is connected in series to the transmitter 9 placed outside the magnetic pump through a transmission wire in opposite phases, and the transmitter performs local display and remote transmission.

The first coil 71a and the second coil 71b are rectangular flat wound coils, the outer parts of the coils are wrapped with insulating resin, and are pasted and fixed on the outer surface of the isolation sleeve 7 with high temperature resistant glue.

The magnetic pump with the inner magnetic rotor offset monitoring device of the present invention includes a pump body 1, a pump cover 2, a main shaft 3, a bearing device 4, an impeller 5, an inner magnetic rotor 6, an isolation sleeve 7, and an outer magnetic rotor 8. The feature is: a magnetic pump inner magnetic rotor offset monitoring device is arranged between the inner magnetic rotor 6 and the isolation sleeve 7;

The magnetic pump inner magnetic rotor offset monitoring device consists of a first inner permanent magnet 61a and a second inner permanent magnet 61b that are symmetrically and fixedly installed on the centerline of the side end of the inner magnetic rotor 6, and are symmetrically and fixedly installed on the outer surface of the isolation sleeve 7. The first coil 71a and the second coil 71b on the centerline are formed by the transmitter 9 placed outside the magnetic pump;

The volume, shape and magnetic strength of the first inner permanent magnet 61a and the second inner permanent magnet 61b are the same; the coil parameters of the first coil 71a and the second coil 71b are the same; the first coil 71a and the The second coil 71b is connected in series to the transmitter 9 placed outside the magnetic pump through a transmission wire in an opposite phase and connected to the transmitter 9 for local display and remote transmission.

Claims (2)

1. The magnetic rotor deviation monitoring device in the magnetic pump is characterized by comprising a first inner permanent magnet (61a) and a second inner permanent magnet (61b) which are symmetrically and fixedly arranged on the center line on the side end of the inner magnetic rotor (6), a first coil (71a) and a second coil (71b) which are symmetrically and fixedly arranged on the center line on the outer circular surface of an isolation sleeve (7), and a transmitter (9) arranged outside the magnetic pump;

the first coil (71a) and the second coil (71b) are flat winding coils, the outside of each coil is wrapped by insulating resin, and the coils are fixed on the outer circular surface of the isolation sleeve (7) by adopting high-temperature-resistant glue;

the first inner permanent magnet (61a) and the second inner permanent magnet (61b) have the same volume, shape and magnetic strength; the coil parameters of the first coil (71a) and the second coil (71b) are the same; the first coil (71a) and the second coil (71b) are connected in series in opposite phases and are connected with a transmitter (9) arranged outside the magnetic pump through a transmission lead, and the transmitter carries out local display and remote transmission.

2. Magnetic drive pump with interior magnetic rotor skew monitoring device, including the pump body (1), pump cover (2), main shaft (3), bearing device (4), impeller (5), interior magnetic rotor (6), spacer (7), outer magnetic rotor (8), characterized by: an inner magnetic rotor offset monitoring device of the magnetic pump is arranged between the inner magnetic rotor (6) and the isolation sleeve (7);

the magnetic rotor deviation monitoring device in the magnetic pump is composed of a first inner permanent magnet (61a) and a second inner permanent magnet (61b) which are symmetrically and fixedly arranged on the center line of the side end of the inner magnetic rotor (6), a first coil (71a) and a second coil (71b) which are symmetrically and fixedly arranged on the center line of the outer circular surface of the isolation sleeve (7), and a transmitter (9) arranged outside the magnetic pump;

the first inner permanent magnet (61a) and the second inner permanent magnet (61b) have the same volume, shape and magnetic strength; the coil parameters of the first coil (71a) and the second coil (71b) are the same; the first coil (71a) and the second coil (71b) are connected in series in opposite phases and are connected with a transmitter (9) arranged outside the magnetic pump through transmission leads for local display and remote transmission.

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