Protection and alarm device for magnetic suspension blower

Abstract

The utility model discloses a protection and alarm device for a magnetic suspension blower, which relates to the technical field of magnetic suspension blowers and comprises a magnetic suspension blower. The magnetic suspension air blower is provided with a high-speed permanent magnet synchronous motor, an impeller and two magnetic suspension bearings, the high-speed permanent magnet synchronous motor comprises a motor shell, a motor stator fixed in the motor shell and a motor rotor matched with the motor stator, the impeller is fixed to the end of one side of the motor rotor, and the two magnetic suspension bearings are arranged at the two ends of the motor rotor. The rotor protection mechanism comprises an outer seat sleeve fixedly connected with the motor shell, a radial supporting mechanism is arranged in the outer seat sleeve, and the radial supporting mechanism is arranged on the outer side of the motor rotor in a sleeving mode and makes separable contact with the motor rotor. According to the protection and alarm device for the magnetic suspension air blower, the motor rotor can be timely supported when the magnetic suspension bearing is damaged, and safe shutdown is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of magnetic suspension blowers, in particular to a protection and alarm device for magnetic suspension blowers. Background Art

[0002] The magnetic levitation blower is a mechanical device for conveying gas. It adopts core technologies such as magnetic levitation bearings, three-dimensional flow impellers, high-speed permanent magnet synchronous motors, high-efficiency inverter speed regulation, and intelligent monitoring and control. It suspends first and then rotates when starting. It is frictionless and does not require lubrication. The three-dimensional flow impeller is directly connected to the rotor, and the transmission is zero-loss. It is a high-tech green energy-saving and environmentally friendly product. The magnetic levitation blower adopts non-contact, mechanical friction-free magnetic levitation bearings and high-speed, high-power permanent magnet synchronous motors to directly drive high-efficiency fluid impellers, overcoming the shortcomings of traditional blowers and air suspension blowers. It has the advantages of high efficiency, low noise, few failures, and no need for lubrication systems.

[0003] The motor rotor is suspended in the magnetic bearing. If the magnetic bearing is damaged, it is difficult to safely stop the high-speed rotating rotor, which will cause the motor and magnetic bearing to be scrapped.

[0004] To this end, we propose a protection and alarm device for a magnetic levitation blower. Utility Model Content

[0005] The technical problem to be solved by the utility model is to overcome the existing defects and provide a protection and alarm device for a magnetic suspension blower, which can provide timely support to the motor rotor when the magnetic suspension bearing is damaged, is conducive to safe shutdown, and can effectively solve the problems in the background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a protection and alarm device for a magnetic suspension blower, comprising a magnetic suspension blower;

[0007] The magnetic suspension blower has a high-speed permanent magnet synchronous motor, an impeller and a magnetic suspension bearing. The high-speed permanent magnet synchronous motor includes a motor housing, a motor stator fixed in the motor housing, and a motor rotor matched with the motor stator. The impeller is fixed at one end of the motor rotor. There are two magnetic suspension bearings, which are arranged at both ends of the motor rotor.

[0008] The rotor protection mechanism comprises an outer seat sleeve fixedly connected to the motor housing, wherein a radial support mechanism is arranged inside the outer seat sleeve, and the radial support mechanism is sleeved on the outer side of the motor rotor and is in detachable contact with the motor rotor.

[0009] Furthermore, the radial support mechanism includes an elastic track, a retaining sleeve, a ball and a cylinder. The elastic track is fixed in the inner cavity of the outer seat sleeve, and the elastic track has a conical inner wall; the retaining sleeve is annular as a whole and has retaining holes distributed in a ring at one end. A small part of the spherical surface of the ball passes through the retaining hole, and the ball is confined between the retaining sleeve and the conical inner wall of the elastic track; the cylinder is fixed in the motor housing, and the cylinder arm of the cylinder is fixedly connected to the end of the retaining sleeve.

[0010] Furthermore, an elastic retaining sheet is provided on one side of the retaining hole of the retaining sleeve, and the elastic retaining sheet abuts against the spherical surface passing through the retaining hole. The elastic retaining sheet prevents the ball from shaking.

[0011] Furthermore, one side of the cross section of the elastic track is in the shape of a "7".

[0012] Furthermore, a stop ring close to the elastic track is fixed at the end of the retaining sleeve, and the stop ring abuts against the spherical surface of the ball. The stop ring further limits the position of the ball, making installation easier.

[0013] Furthermore, a distance sensor is provided on the inner side of the retaining sleeve, and a controller and an alarm are also provided on the outer wall of the motor housing; the output end of the distance sensor is electrically connected to the input end of the controller, and the output end of the controller is electrically connected to the input end of the alarm.

[0014] Compared with the prior art, the beneficial effects of the utility model are: the protection and alarm device for the magnetic suspension blower has the following advantages:

[0015] 1. Install a rotor protection mechanism at the end of the motor rotor to provide timely support for the motor rotor when the magnetic bearing is damaged, which is conducive to safe shutdown;

[0016] 2. The rotor protection mechanism is mainly realized by radially movable balls. The balls are separated from the motor rotor under normal working conditions. In abnormal conditions, they provide rolling support for the motor rotor, with low friction and smooth operation.

[0017] 3. With protection and alarm functions, it can shut down the machine in time to reduce losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall axial side structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the overall cross-sectional structure of the utility model;

[0020] Figure 3 This is a schematic diagram of the structure of the rotor protection mechanism of the utility model;

[0021] Figure 4 This is a schematic diagram of the shaft side of the rotor protection mechanism of the utility model;

[0022] Figure 5 It is a partial structural schematic diagram of the rotor protection mechanism of the utility model;

[0023] Figure 6 This is a schematic diagram of the structure of point A of the utility model.

[0024] In the figure: 1 impeller, 2 magnetic bearing, 3 motor housing, 4 motor stator, 5 motor rotor, 6 outer seat sleeve, 7 elastic track, 8 retaining sleeve, 801 retaining hole, 802 elastic retaining sheet, 803 anti-slip ring, 9 ball, 10 cylinder, 11 distance sensor, 12 controller, 13 alarm. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] See also Figure 1-6 , this embodiment provides a technical solution: a protection and alarm device for a magnetic suspension blower, the magnetic suspension blower has a high-speed permanent magnet synchronous motor, an impeller 1 and a magnetic suspension bearing 2, the high-speed permanent magnet synchronous motor includes a motor housing 3, a motor stator 4 fixed in the motor housing 3, and a motor rotor 5 matched with the motor stator 4, the impeller 1 is fixed at one end of the motor rotor 5, and there are two magnetic suspension bearings 2, which are arranged at both ends of the motor rotor 5; the impeller 1 is arranged in a spiral shell, which is not shown in the figure;

[0027] The rotor protection mechanism comprises an outer sleeve 6 fixedly connected to the motor housing 3, a radial support mechanism is arranged inside the outer sleeve 6, the radial support mechanism is sleeved on the outer side of the motor rotor 5 and is in detachable contact with the motor rotor 5. The rotor protection mechanism is installed at the end of the motor rotor 5, which can provide timely support to the motor rotor 5 when the magnetic bearing 2 is damaged, and is conducive to safe shutdown.

[0028] The radial support mechanism includes an elastic track 7, a retaining sleeve 8, a ball 9 and a cylinder 10. The elastic track 7 is fixed in the inner cavity of the outer seat sleeve 6, and the elastic track 7 has a conical inner wall. One side of the cross section of the elastic track 7 is in the shape of a "7"; the retaining sleeve 8 is annular as a whole and has retaining holes 801 distributed in an annular manner at one end. A small part of the spherical surface of the ball 9 passes through the retaining hole 801, and the ball 9 is confined between the retaining sleeve 8 and the conical inner wall of the elastic track 7; the rotor protection mechanism is mainly realized by the radially movable ball 9. The ball 9 is separated from the motor rotor 5 under normal working conditions, and provides rolling support for the motor rotor 5 in abnormal conditions. The friction force of the rolling friction is small and the operation is stable.

[0029] The elastic track 7 has a certain deformation ability, and its conical part provides support force for the ball 9 and cooperates with the retaining sleeve 8 to limit the position of the ball 9.

[0030] A small part of the spherical surface of the ball 9 passes through the retaining hole 801 , that is, the maximum width of the retaining hole 801 is smaller than the diameter of the ball 9 , so that the ball 9 cannot directly pass through the retaining hole 801 .

[0031] The cylinder 10 is fixed in the motor housing 3, and the cylinder arm of the cylinder 10 is fixedly connected to the end of the retaining sleeve 8. The function of the cylinder is to drive the retaining sleeve 8 and the elastic track 7 to produce relative displacement in the axial direction. The retaining sleeve 8 drives the ball 9 to fit the cone cylinder and move along the axial direction of the elastic track 7. The cone cylinder makes the inner diameter of the elastic track 7 change. During the axial movement of the ball 9, the distance between the ball 9 and the motor rotor 5 also changes. Figure 3 Taking the orientation as an example to illustrate the position change of ball 9, when the magnetic levitation blower is working normally, ball 9 is in a lower position and is completely separated from the motor rotor 5. When it is abnormal, cylinder 10 drives the retaining sleeve 8 to move upward. Due to the limitation of the taper of the elastic track 7, ball 9 produces radial displacement, and then contacts with the motor rotor 5 and provides rolling support. At the same time, the motor rotor 5 is always suspended and does not impact with the magnetic levitation bearing 2, which can ensure the magnetic levitation bearing 2 and the high-speed permanent magnet synchronous motor.

[0032] An elastic retaining sheet 802 is provided on one side of the retaining hole 801 on the retaining sleeve 8, and the elastic retaining sheet 802 rests on the spherical surface passing through the retaining hole 801; the elastic retaining sheet 802 and the elastic track 7 are respectively located on the inner and outer sides of the ball 9 to provide support and limitation. The elasticity of the two makes the ball 9 have appropriate buffer space, thereby enhancing the buffering effect on the motor rotor 5.

[0033] The end of the retaining sleeve 8 is fixed with a locking ring 803 leaning against the elastic track 7. The locking ring 803 abuts against the spherical surface of the ball 9. The locking ring 803 increases the restriction on the ball 9 to prevent it from falling off and facilitates installation.

[0034] A distance sensor 11 is provided on the inner side of the retaining sleeve 8, and a controller 12 and an alarm 13 are also provided on the outer wall of the motor housing 3; the output end of the distance sensor 11 is electrically connected to the input end of the controller 12, and the output end of the controller 12 is electrically connected to the input end of the alarm 13; the distance sensor 11 is used to detect the radial distance of the motor rotor 5 in the retaining sleeve 8 and transmit the data to the controller 12. If the motor rotor 5 deviates from the suspended state, the controller 12 feedback drives the cylinder 10 to respond, connects to the network and prompts the position through the alarm 13.

[0035] The working principle of the protection and alarm device for a magnetic suspension blower provided by the utility model is as follows:

[0036] Under normal working conditions, the magnetic bearing 2 suspends the motor rotor 5, and the high-speed permanent magnet synchronous motor drives the motor rotor 5 and the impeller 1 to rotate;

[0037] When an abnormality occurs, the distance sensor 11 detects the position deviation of the motor rotor 5, and the controller 12 feedback drives the cylinder 10, which drives the retaining sleeve 8 to move upward. Due to the limitation of the taper of the elastic track 7, the ball 9 produces radial displacement, and then contacts the motor rotor 5 and provides rolling support. During this process, the motor rotor 5 is always suspended and does not impact the magnetic bearing 2, thereby playing a protective role.

[0038] The above are only embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A protection and alarm device for a magnetic suspension blower, characterized in that: Includes magnetic levitation blower; The magnetic suspension blower comprises a high-speed permanent magnet synchronous motor, an impeller (1) and a magnetic suspension bearing (2); the high-speed permanent magnet synchronous motor comprises a motor housing (3), a motor stator (4) fixed in the motor housing (3), and a motor rotor (5) matched with the motor stator (4); the impeller (1) is fixed at one end of the motor rotor (5); and two magnetic suspension bearings (2) are arranged at both ends of the motor rotor (5); The rotor protection mechanism comprises an outer seat sleeve (6) fixedly connected to the motor housing (3), wherein a radial support mechanism is arranged inside the outer seat sleeve (6), and the radial support mechanism is sleeved on the outer side of the motor rotor (5) and is in detachable contact with the motor rotor (5).

2. A protection and alarm device for a magnetic suspension blower according to claim 1, characterized in that: The radial support mechanism comprises an elastic track (7), a retaining sleeve (8), a ball (9) and a cylinder (10); the elastic track (7) is fixed in the inner cavity of the outer seat sleeve (6), and the elastic track (7) has a conical inner wall; The retaining sleeve (8) is annular in shape as a whole and has retaining holes (801) distributed in an annular pattern at one end. A small portion of the spherical surface of the ball (9) passes through the retaining hole (801), and the ball (9) is confined between the retaining sleeve (8) and the conical inner wall of the elastic track (7). The cylinder (10) is fixed in the motor housing (3), and the cylinder arm of the cylinder (10) is fixedly connected to the end of the retaining sleeve (8).

3. A protection and alarm device for a magnetic suspension blower according to claim 2, characterized in that: An elastic retaining sheet (802) is provided on one side of the retaining hole (801) on the retaining sleeve (8), and the elastic retaining sheet (802) abuts against a spherical surface passing through the retaining hole (801).

4. The protection and alarm device for a magnetic suspension blower according to claim 2 is characterized in that: One side of the cross section of the elastic track (7) is in the shape of a "7".

5. The protection and alarm device for a magnetic suspension blower according to claim 2 is characterized in that: A stop ring (803) is fixed at the end of the retaining sleeve (8) and is close to the elastic track (7), and the stop ring (803) is against the spherical surface of the ball (9).

6. A protection and alarm device for a magnetic suspension blower according to claim 5, characterized in that: The inner side surface of the retaining sleeve (8) is provided with a distance sensor (11), and the outer wall of the motor housing (3) is also provided with a controller (12) and an alarm (13); The output end of the distance sensor (11) is electrically connected to the input end of the controller (12), and the output end of the controller (12) is electrically connected to the input end of the alarm (13).

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