Magnetic rotor deviation monitoring device in magnetic pump and magnetic pump

Abstract

The present invention discloses a magnetic pump internal magnetic rotor deviation monitoring device and a magnetic pump, comprising a first inner permanent magnet (61a) and a second inner permanent magnet (61b) symmetrically fixedly mounted on the center line of the side end of the inner magnetic rotor (6), a first coil (71a) and a second coil (71b) symmetrically fixedly mounted on the center line of the outer circumferential surface of an isolation sleeve (7), and a transmitter (9) disposed outside the magnetic pump, forming the magnetic pump internal magnetic rotor deviation monitoring device; the first inner permanent magnet and the second inner permanent magnet have the same magnetic strength; the first coil and the second coil have the same coil parameters; the first coil and the second coil are connected in series with opposite phases and are connected to the transmitter disposed outside the magnetic pump through a transmission wire, and the induced electromotive force or induced current is compared and processed by the transmitter, thereby monitoring the deviation of the main shaft system of the magnetic pump in real time, and performing local display and remote control.

Description

Technical Field

[0001] The invention relates to a magnetic pump, in particular to an internal magnetic rotor deviation monitoring device of a magnetic pump. Background Art

[0002] During the operation of the magnetic pump, the following situations may cause friction and damage between the inner magnetic rotor and the inner wall of the isolation sleeve, resulting in a fault and shutdown:

[0003] 1. The sliding bearing is made of soft materials such as graphite. After running for a certain period of time, the gap between the sliding bearing and the sleeve is too large. If it is not replaced in time, the uneven force on the rotor system when the operating conditions change will cause friction damage between the inner magnetic rotor and the inner wall of the isolation sleeve.

[0004] 2. When the sliding bearing or sleeve is made of hard materials such as SiC, the material itself is very brittle and may crack during operation, causing the rotor system to shift. If not discovered in time, friction damage may occur between the inner magnetic rotor and the inner wall of the isolation sleeve.

[0005] 3. The magnetic force distribution of the magnetic steel installed on the inner and outer magnetic rotors is uneven. As the running time increases, it will cause uneven force on the rotor system and accelerate bearing wear. If it is not discovered in time, it will cause friction damage between the inner magnetic rotor and the inner wall of the isolation sleeve.

[0006] 4. Other uncertain factors. Summary of the invention

[0007] The purpose of the present invention is to provide a magnetic pump internal magnetic rotor deviation monitoring device and a magnetic pump using the internal magnetic rotor deviation monitoring device, so as to monitor the rotor system deviation in real time and prevent the internal magnetic rotor from rubbing against the inner wall of the isolation sleeve to prevent safety accidents.

[0008] The magnetic pump internal magnetic rotor deviation monitoring device of the present invention is composed of a first internal permanent magnet and a second internal permanent magnet symmetrically fixedly mounted on the center line of the side end of the internal magnetic rotor, a first coil and a second coil symmetrically fixedly mounted on the center line of the outer circumferential surface of the isolation sleeve, and a transmitter placed outside the magnetic pump;

[0009] The first coil 71a and the second coil 71b are flat winding coils, the outside of the coils are wrapped with insulating resin, and are fixed to the outer circumferential surface of the isolation sleeve 7 with high temperature resistant adhesive.

[0010] The first inner permanent magnet and the second inner permanent magnet have the same volume, shape and magnetic strength; the first coil and the second coil have the same coil parameters; the first coil and the second coil are connected in series with opposite phases and are connected to a transmitter placed outside the magnetic pump through a transmission wire, and the transmitter performs local display and remote transmission.

[0011] The present invention symmetrically (i.e., 180°) fixes the first inner permanent magnet and the second inner permanent magnet on the center line of the side end of the inner magnetic rotor, and symmetrically (i.e., 180°) fixes the first coil and the second coil on the center line of the outer circumference of the isolation sleeve. When the inner magnetic rotor rotates, the first inner permanent magnet and the second inner permanent magnet on the inner magnetic rotor correspond to the first coil and the second coil on the outer circumference of the isolation sleeve in the radial direction, and 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 circumference of the isolation sleeve, and the first coil and the second coil respectively generate induced electromotive force (induced current), and the first coil and the second coil are connected in series in opposite phases and are connected to the transmitter placed outside the magnetic pump through a transmission wire.

[0012] When the inner magnetic rotor has no radial offset, that is, the spacing between the inner magnetic rotor and the first inner permanent magnet and the second inner permanent magnet thereon and the isolating sleeve is equal, the spacing between the first inner permanent magnet and the second inner permanent magnet on the inner magnetic rotor and the first coil and the second coil on the isolating sleeve is equal, and the induced electromotive force (induced current) generated by the first coil and the second coil being cut by the magnetic lines of force of the first inner permanent magnet and the second inner permanent magnet is the same in magnitude and opposite in direction; since the first coil and the second coil are connected in series with opposite phases, the induced electromotive force (induced current) generated by the first coil and the second coil connected in series with opposite phases cancel each other out, and the output induced electromotive force (induced current) is zero.

[0013] When the inner magnetic rotor is radially offset, that is, the distance between the inner magnetic rotor and the first inner permanent magnet and the second inner permanent magnet thereon and the isolating sleeve is radially offset to one side, the distance between the first inner permanent magnet and the second inner permanent magnet on the inner magnetic rotor and the first coil and the second coil on the isolating sleeve changes, that is, the distance between the first inner permanent magnet and the second inner permanent magnet and the first coil is larger than the distance between the first inner permanent magnet and the second inner permanent magnet and the second coil; due to the different distances between the permanent magnets and the coils, the strength of the permanent magnet magnetic lines of force cutting the coils is different, so the induced electromotive force (induced current) generated by the first coil and the second coil is different in magnitude, so the induced electromotive force (induced current) generated by the first coil and the second coil in opposite phases in series cannot completely offset each other, and the output induced electromotive force (induced current) is greater than zero; the induced electromotive force (induced current) is compared and processed (filtered, amplified) by the transmitter, so as to determine whether the inner magnetic rotor is radially offset and the radial offset amount, and to perform local display and remote control, so as to monitor the offset of the main shaft system of the magnetic pump in real time, and prevent the inner magnetic rotor from rubbing against the inner wall of the isolating sleeve and causing safety accidents.

[0014] The magnetic pump with an internal magnetic rotor deviation monitoring device of the present invention comprises a pump body, a pump cover, a main shaft, a bearing device, an impeller, an internal magnetic rotor, an isolation sleeve, and an external magnetic rotor, and is characterized in that: the magnetic pump internal magnetic rotor deviation monitoring device is provided between the internal magnetic rotor and the isolation sleeve;

[0015] The magnetic pump inner magnetic rotor deviation monitoring device is composed of a first inner permanent magnet and a second inner permanent magnet symmetrically fixedly mounted on the center line of the side end of the inner magnetic rotor, a first coil and a second coil symmetrically fixedly mounted on the center line of the outer circumferential surface of the isolation sleeve, and a transmitter placed outside the magnetic pump;

[0016] The first inner permanent magnet and the second inner permanent magnet have the same volume, shape and magnetic strength; the first coil and the second coil have the same coil parameters; the first coil and the second coil are connected in series with opposite phases and are connected to a transmitter placed outside the magnetic pump through a transmission wire for local display and remote transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of an embodiment of a device for monitoring the deviation of a magnetic rotor in a magnetic pump according to the present invention.

[0018] Figure 2 yes Figure 1 AA section view.

[0019] Figure 3 It is a schematic structural diagram of a magnetic pump embodiment with an internal magnetic rotor deviation monitoring device according to the present invention. DETAILED DESCRIPTION

[0020] The magnetic pump internal magnetic rotor deviation monitoring device of the present invention is composed of a first internal permanent magnet 61a and a second internal permanent magnet 61b symmetrically fixedly mounted on the center line of the side end of the internal magnetic rotor 6, a first coil 71a and a second coil 71b symmetrically fixedly mounted on the center line of the outer circumferential surface of the isolation sleeve 7, and a transmitter 9 placed outside the magnetic pump;

[0021] The first inner permanent magnet 61a and the second inner permanent magnet 61b have the same volume, shape and magnetic strength; the first coil 71a and the second coil 71b have the same coil parameters; the first coil 71a and the second coil 71b are connected in series with opposite phases and are connected to the transmitter 9 placed outside the magnetic pump through a transmission wire, and the transmitter performs local display and remote transmission.

[0022] The first coil 71a and the second coil 71b are rectangular flat winding coils, the outside of the coils are wrapped with insulating resin, and are fixed to the outer circumferential surface of the isolation sleeve 7 with high temperature resistant adhesive.

[0023] The magnetic pump with an internal magnetic rotor deviation monitoring device of the present invention comprises a pump body 1, a pump cover 2, a main shaft 3, a bearing device 4, an impeller 5, an internal magnetic rotor 6, a spacer sleeve 7, and an external magnetic rotor 8, wherein the magnetic pump internal magnetic rotor deviation monitoring device is provided between the internal magnetic rotor 6 and the spacer sleeve 7;

[0024] The magnetic pump inner magnetic rotor deviation monitoring device is composed of a first inner permanent magnet 61a and a second inner permanent magnet 61b symmetrically fixedly mounted on the center line of the side end of the inner magnetic rotor 6, a first coil 71a and a second coil 71b symmetrically fixedly mounted on the center line of the outer circumferential surface of the isolation sleeve 7, and a transmitter 9 placed outside the magnetic pump;

[0025] The first inner permanent magnet 61a and the second inner permanent magnet 61b have the same volume, shape and magnetic strength; the first coil 71a and the second coil 71b have the same coil parameters; the first coil 71a and the second coil 71b are connected in series with opposite phases and are connected to the transmitter 9 placed outside the magnetic pump through a transmission wire for local display and remote transmission.

Claims

1. A device for monitoring the displacement of a magnetic rotor in a magnetic pump, characterized in that: The magnetic pump inner magnetic rotor deviation monitoring device comprises a first inner permanent magnet (61a) and a second inner permanent magnet (61b) symmetrically fixedly mounted on the center line of the side end of the inner magnetic rotor (6), a first coil (71a) and a second coil (71b) symmetrically fixedly mounted on the center line of the outer circumferential surface of the isolation sleeve (7), and a transmitter (9) disposed outside the magnetic pump; The first coil (71a) and the second coil (71b) are flat wound coils, the outside of the coils are wrapped with insulating resin, and are fixed to the outer circumferential surface of the isolation sleeve (7) by using high temperature resistant adhesive; The first inner permanent magnet (61a) and the second inner permanent magnet (61b) have the same volume, shape and magnetic strength; the first coil (71a) and the second coil (71b) have the same coil parameters; when the inner magnetic rotor (6) rotates, the first inner permanent magnet (61a) and the second inner permanent magnet (61b) on the inner magnetic rotor (6) correspond to the first coil (71a) and the second coil (71b) on the outer circumferential surface of the isolation sleeve (7) in the radial direction, and the first inner permanent magnet (61a) and the second inner permanent magnet (61b) on the inner magnetic rotor (6) cut the first coil (71a) and the second coil (71b) on the outer circumferential surface of the isolation sleeve (7), and the first coil (71a) and the second coil (71b) respectively generate induced electromotive force; the first coil (71a) and the second coil (71b) are connected in series with opposite phases and connected to a transmitter (9) placed outside the magnetic pump through a transmission wire, and the transmitter performs local display and remote transmission.

2. A magnetic pump with an internal magnetic rotor deviation monitoring device, comprising a pump body (1), a pump cover (2), a main shaft (3), a bearing device (4), an impeller (5), an internal magnetic rotor (6), a spacer sleeve (7), and an external magnetic rotor (8), wherein: The magnetic pump is provided with a magnetic pump inner magnetic rotor deviation monitoring device between the inner magnetic rotor (6) and the isolation sleeve (7); The magnetic pump inner magnetic rotor deviation monitoring device comprises a first inner permanent magnet (61a) and a second inner permanent magnet (61b) symmetrically fixedly mounted on the center line of the side end of the inner magnetic rotor (6), a first coil (71a) and a second coil (71b) symmetrically fixedly mounted on the center line of the outer circumferential surface of the isolation sleeve (7), and a transmitter (9) disposed 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 first coil (71a) and the second coil (71b) have the same coil parameters; when the inner magnetic rotor (6) rotates, the first inner permanent magnet (61a) and the second inner permanent magnet (61b) on the inner magnetic rotor (6) correspond to the first coil (71a) and the second coil (71b) on the outer circumferential surface of the isolation sleeve (7) in the radial direction, and the first inner permanent magnet (61a) and the second inner permanent magnet (61b) on the inner magnetic rotor (6) cut the first coil (71a) and the second coil (71b) on the outer circumferential surface of the isolation sleeve (7), and the first coil (71a) and the second coil (71b) respectively generate induced electromotive force; the first coil (71a) and the second coil (71b) are connected in series with opposite phases and are connected to a transmitter (9) placed outside the magnetic pump through a transmission wire for local display and remote transmission.

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