Low-speed direct-drive permanent magnet motor for inflatable flotation machine

Abstract

This invention discloses a low-speed direct-drive permanent magnet motor for an aerated flotation machine, relating to the field of permanent magnet drive technology. It includes a frame, stator, rotor, cooling device, and rotary sealing heat insulation device. The key feature is that at least one cooling device is installed on one side of the frame, and upper and lower end covers are respectively provided on the upper and lower sides of the frame. The stator and rotor are both installed inside the frame. The rotor has a hollow rotor shaft. The non-drive end of the hollow rotor shaft is equipped with a double-row full complement cylindrical roller bearing, and the drive end of the hollow rotor shaft is equipped with two sets of face-to-face tapered roller bearings. The bearings of this invention can withstand the radial and axial forces generated during normal operation of the flotation machine. The double-row full complement cylindrical roller bearing at the non-drive end withstands the radial forces generated by components such as the flotation machine impeller, and the two face-to-face tapered roller bearings at the drive end withstand the axial forces of components such as the flotation machine impeller and the motor rotor itself.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of permanent magnet driving machines, in particular to a low-speed direct-drive permanent magnet motor for an inflatable flotation machine. BACKGROUND

[0002] The flotation machine is driven by a motor triangular belt to rotate an impeller, and comprises a motor 9, a motor side pulley 10, a triangular belt 11 and a pulley 12, etc. Figure 8 As shown in the figure, centrifugal action is generated to form a negative pressure, which absorbs sufficient air to mix with the ore pulp on one hand and stirs the ore pulp to mix with the medicine on the other hand, and meanwhile, the froth is refined to make the mineral adhere to the froth and float to the ore pulp surface to form mineralized froth.

[0003] The transmission device of the conventional flotation machine generally adopts an asynchronous motor to drive the main shaft and the rotor in the form of a belt, and the belt connection mode has low running efficiency, high failure rate and high maintenance and repair cost.

[0004] After the direct drive of the permanent magnet motor is adopted, the motor itself has energy-saving effect, the transmission chain is shortened, the failure points are reduced, and the power transmission efficiency is improved. SUMMARY

[0005] The application aims to provide a low-speed direct-drive permanent magnet motor for an inflatable flotation machine, and solve the following technical problems:

[0006] How to solve the problem of slow running efficiency of the flotation machine driven by the triangular belt.

[0007] The application can be realized by the following technical scheme:

[0008] A low-speed direct-drive permanent magnet motor for an inflatable flotation machine comprises a base, a stator, a rotor, a cooling device and a rotary sealing and heat insulation device, at least one group of cooling devices is installed on one side of the base;

[0009] Upper and lower end covers are arranged on the upper and lower sides of the base, respectively, and the stator and the rotor are both installed in the interior of the base;

[0010] A rotor hollow shaft is arranged in the interior of the rotor, a double-row full-depth cylindrical roller bearing is arranged on the non-driving end of the rotor hollow shaft, used for bearing the radial force generated by the flotation machine impeller and other components, two groups of face-to-face installed tapered roller bearings are arranged on the driving end of the rotor hollow shaft, used for bearing the axial force of the flotation machine impeller and other components and the rotor of the motor itself, and a non-driving end bearing outer pressure cover is arranged on the upper side of the non-driving end of the rotor hollow shaft.

[0011] As a further scheme of the present application: the outer wall of the base is provided with several heat dissipation ribs.

[0012] As a further scheme of the present application: the lower side of the tapered roller bearing is provided with a locking round nut and a stop washer for fixing.

[0013] As a further scheme of the present application: the cooling device comprises a long cylindrical wind cover and at least three groups of axial flow fans, the long cylindrical wind cover is a long cylindrical shape, and the several axial flow fans are uniformly distributed on the upper end of the long cylindrical wind cover.

[0014] As a further scheme of the present application: the inside of the cooling device is provided with air holes between the several axial flow fans.

[0015] As a further scheme of the present application: the long cylindrical wind cover covers 2 / 3 of the entire motor base.

[0016] As a further scheme of the present application: the inside of the rotor hollow shaft is provided with a vacuum heat insulation layer for blocking heat conduction, thereby avoiding the problem of unqualified temperature rise of the motor, preventing the heat of 80℃ air from being conducted to the inside of the permanent magnet motor through the rotor hollow shaft, causing the temperature of the motor to continuously rise and affecting the service life.

[0017] As a further scheme of the present application: the outside of the rotor hollow shaft is provided with an auxiliary plate, and several round holes are formed in the side surface of the auxiliary plate to reduce the weight of the rotor and reduce the axial force of the rotor itself.

[0018] As a further scheme of the present application: the side surface of the rotor hollow shaft is provided with a protruding part extending to the side above the non-driving end bearing outer pressure cover, and a rotary sealing and heat insulation device is installed between the protruding part and the non-driving end bearing outer pressure cover.

[0019] As a further scheme of the present application: the rotary sealing and heat insulation device comprises three groups of heat insulation plates, the three groups of heat insulation plates are respectively in contact with the non-driving end bearing outer pressure cover and the protruding part of the rotor hollow shaft, and the outside of the three groups of heat insulation plates is provided with an O-shaped sealing ring to prevent high-pressure and high-temperature air from leaking radially, so as to ensure that the air entering the ore pulp meets the requirements.

[0020] As a further scheme of the present application: at least two groups of Carter sealing structures are arranged between the rotary sealing and heat insulation device and the rotor hollow shaft to prevent high-pressure and high-temperature air from entering the non-driving end bearing chamber through the gap between the rotary sealing and heat insulation device and the rotor hollow shaft, and prevent the bearing temperature from being high.

[0021] As a further scheme of the present application: the side surface of the rotor is provided with a vacuum ball valve in communication with the rotor hollow shaft.

[0022] The beneficial effects of this invention are:

[0023] The bearing of this invention can bear the radial and axial forces generated during the normal operation of the flotation machine. The non-drive end is provided with a double-row full complement cylindrical roller bearing to bear the radial force generated by the flotation machine impeller and other components. The drive end is provided with two tapered roller bearings installed face to face to bear the axial force of the flotation machine impeller and other components and the rotor of the motor itself. The tapered roller bearings are fixed with a locking nut and a retaining washer at the bottom.

[0024] The low-speed direct-drive permanent magnet motor for the aerated flotation machine of this invention adopts an air-cooled method. Compared with the water-cooled method, it has a simpler structure and is easier to maintain and repair. The water-cooled method requires additional circulating water, and the motor cooling water channel is prone to scale buildup, which reduces the cooling effect over time. The air-cooled structure uses three axial flow fans at the upper end of the low-speed direct-drive permanent magnet motor, which are evenly distributed at the upper end of the fan shroud cylinder. The fan shroud cylinder is designed as an elongated cylinder that covers 2 / 3 of the motor base, which is conducive to heat dissipation of the motor.

[0025] The inner hole of the hollow rotor shaft is used to pass the air required by the slurry. The hollow rotor shaft is equipped with a vacuum insulation layer to block heat conduction, thereby ensuring that the motor temperature rise is qualified and preventing the heat of 80°C air from being conducted to the permanent magnet motor when passing through the hollow shaft, which would cause the motor temperature to rise continuously and affect its service life. At the same time, the auxiliary plate on the hollow rotor shaft has an appropriate number of round holes to reduce the rotor weight and reduce the axial force of the rotor itself.

[0026] The rotary sealing heat insulation device is located on the upper end of the outer pressure cover of the non-drive end bearing. It isolates the heat conduction to the outer pressure cover of the non-drive end bearing and the non-drive end bearing through three high-temperature heat insulation plates. It is also equipped with an O-ring to prevent high-pressure and high-temperature air from leaking radially, so as to ensure that the air introduced into the slurry meets the required requirements. Two car-type sealing structures are provided between the outer pressure cover of the non-drive end bearing and the hollow rotor shaft to prevent high-pressure and high-temperature air from entering the non-drive end bearing chamber through the gap between the outer pressure cover of the non-drive end bearing and the hollow rotor shaft, thus preventing the bearing temperature from becoming too high. Attached Figure Description

[0027] The invention will now be further described with reference to the accompanying drawings.

[0028] Figure 1 This is a schematic diagram of the permanent magnet direct drive motor in this invention;

[0029] Figure 2 This is a schematic diagram of a flotation machine structure based on the permanent magnet direct drive motor in this invention;

[0030] Figure 3 This is a schematic diagram of the rotary sealing heat insulation device in this invention;

[0031] Figure 4This is a front view of the cooling device in this invention;

[0032] Figure 5 This is a side view of the cooling device in this invention;

[0033] Figure 6 This is a schematic diagram of the rotor structure in this invention;

[0034] Figure 7 This is a side view of the rotor in this invention;

[0035] Figure 8 This is a schematic diagram of a traditional flotation machine;

[0036] In the diagram: 1. Cooling device; 2. Stator; 3. Rotor; 4. Hollow rotor shaft; 5. Tapered roller bearing; 6. Frame; 7. Double-row full complement cylindrical roller bearing; 8. Rotary sealing heat insulation device; 9. Motor; 10. Motor side pulley; 11. V-belt; 12. Pulley; 13. Hollow shaft; 14. O-ring seal; 15. Heat insulation plate; 16. Non-drive end bearing outer pressure cover; 18. Long cylindrical fan hood; 19. Vent hole; 20. Axial flow fan; 21. Auxiliary plate; 22. Vacuum insulation layer; 23. Vacuum ball valve; 24. Chevron seal structure. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Please see Figures 1-7 As shown, the present invention is a low-speed direct-drive permanent magnet motor for an aerated flotation machine, including a frame 6, a stator 2, a rotor 3, a cooling device 1 and a rotary sealing heat insulation device 8. At least one set of cooling devices 1 is installed on one side of the frame 6, and a number of heat dissipation fins are provided on the outer wall of the frame 6.

[0039] The upper and lower sides of the frame 6 are respectively provided with an upper end cover and a lower end cover, and the stator 2 and the rotor 3 are both installed inside the frame 6;

[0040] The rotor 3 has a hollow rotor shaft 4 inside. The non-drive end of the hollow rotor shaft 4 is equipped with a double-row full complement cylindrical roller bearing 7 to bear the radial force generated by the flotation machine impeller and other components. The drive end of the hollow rotor shaft 4 is equipped with two sets of face-to-face tapered roller bearings 5 ​​to bear the axial force of the flotation machine impeller and other components and the rotor 3 of the motor itself. The upper side of the non-drive end of the hollow rotor shaft 4 is equipped with a non-drive end bearing outer pressure cover 16, and the rotary sealing heat insulation device 8 is located above the non-drive end bearing outer pressure cover 16.

[0041] The tapered roller bearing 5 has a locking nut and a retaining washer on its underside for securing it.

[0042] Please see Figure 3 As shown, the side of the rotor hollow shaft 4 is provided with a protruding part extending to the side on the upper side of the non-drive end bearing outer pressure cover 16, and a rotary sealing heat insulation device 8 is installed between the protruding part and the non-drive end bearing outer pressure cover 16.

[0043] The rotary sealing heat insulation device 8 includes three sets of heat insulation plates 15. The three sets of heat insulation plates 15 are in contact with the outer pressure cover 16 of the non-drive end bearing and the protruding part of the rotor hollow shaft 4, respectively. O-rings 14 are provided on the outer side of the three sets of heat insulation plates 15 to prevent high-pressure and high-temperature air from leaking radially, so as to ensure that the air introduced into the slurry can meet the required requirements.

[0044] At least two sets of Chevron sealing structures 24 are provided between the rotary sealing heat insulation device 8 and the hollow rotor shaft 4, namely, the rotary shaft uses a toothed slip ring type combined seal TB3-Ⅰ to prevent high pressure and high temperature air from entering the non-drive end bearing chamber through the gap between the rotary sealing heat insulation device 8 and the hollow rotor shaft 4, thus preventing the bearing temperature from being too high.

[0045] Please see Figures 4-5 As shown, the cooling device 1 includes a long cylindrical shroud 18 and at least three sets of axial flow fans 20. The long cylindrical shroud 18 is long and cylindrical, and several axial flow fans 20 are evenly distributed on the upper end of the long cylindrical shroud 18. The long cylindrical shroud 18 covers 2 / 3 of the entire motor base 6.

[0046] The cooling device 1 has ventilation holes 19 located between several axial flow fans 20 inside.

[0047] Please see Figures 6-7 As shown, a vacuum ball valve 23 connected to the hollow rotor shaft 4 is installed on the side of the rotor 3. A vacuum insulation layer 22 is provided inside the hollow rotor shaft 4 to block heat conduction, thereby avoiding the problem of the motor failing to meet the temperature requirements and preventing the heat of 80°C air from being conducted to the inside of the permanent magnet motor when passing through the hollow rotor shaft 4, causing the motor 9 temperature to rise continuously and affecting its service life.

[0048] An auxiliary plate 21 is provided on the outer side of the hollow rotor shaft 4. Several round holes are provided on the side of the auxiliary plate 21 to reduce the weight of the rotor 3 and reduce the axial force of the rotor 3 itself.

[0049] Working principle of the invention:

[0050] In use, the bottom end of the rotor hollow shaft 4 is connected to a communicating hollow shaft 13, and the top of the rotor hollow shaft 4 is equipped with an air inlet for introducing air at about 80°C and 60 kPa into the hollow shaft 13.

[0051] During operation, rotor 3 drives rotor hollow shaft 4 to rotate, which in turn drives hollow shaft 13 to rotate. The heat conduction is blocked by vacuum insulation layer 22, which ensures that the motor temperature will not be too high and prevents the heat of 80°C air from being conducted to the permanent magnet motor through hollow shaft 13, which would cause the motor temperature to rise continuously and affect its service life. At the same time, the auxiliary plate 21 on rotor 3 shaft has a certain number of round holes to reduce the weight of the rotor and reduce the axial force of rotor 3 itself.

[0052] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A low-speed direct-drive permanent magnet motor for an inflatable flotation machine, comprising a base (6), a stator (2), a rotor (3), a cooling device (1) and a rotary sealing and heat insulation device (8), characterized in that, At least one set of cooling devices (1) is installed on one side of the frame (6); An upper end cover and a lower end cover are respectively arranged on the upper and lower sides of the frame (6), and the stator (2) and the rotor (3) are both installed in the frame (6); A rotor hollow shaft (4) is arranged in the rotor (3), a double-row full complement cylindrical roller bearing (7) is arranged at the non-driving end of the rotor hollow shaft (4), two sets of face-to-face installed tapered roller bearings (5) are arranged at the driving end of the rotor hollow shaft (4), a non-driving end bearing outer pressure cover (16) is arranged on the upper side of the non-driving end of the rotor hollow shaft (4), and the rotary sealing and heat insulation device (8) is arranged above the non-driving end bearing outer pressure cover (16); The cooling device (1) comprises a long cylindrical wind cover (18) and at least three sets of axial flow fans (20), the long cylindrical wind cover (18) is in a long cylindrical shape, and the plurality of axial flow fans (20) are uniformly distributed on the upper end of the long cylindrical wind cover (18); The long cylindrical wind cover (18) covers 2 / 3 of the whole frame (6); A vacuum heat insulation layer (22) is arranged in the rotor hollow shaft (4); A protruding part extending to the side is arranged on the upper side of the non-driving end bearing outer pressure cover (16) of the rotor hollow shaft (4), and the rotary sealing and heat insulation device (8) is arranged between the protruding part and the non-driving end bearing outer pressure cover (16); The rotary sealing and heat insulation device (8) comprises three sets of heat insulation plates (15), the three sets of heat insulation plates (15) are respectively in contact with the non-driving end bearing outer pressure cover (16) and the protruding part of the rotor hollow shaft (4), and O-shaped sealing rings (14) are arranged on the outer sides of the three sets of heat insulation plates (15).

2. The low-speed direct-drive permanent-magnet motor for a pneumatic flotation machine according to claim 1, characterized in that A plurality of heat dissipation ribs are arranged on the outer wall of the frame (6).

3. The low-speed direct-drive permanent-magnet motor for a pneumatic flotation machine according to claim 1, characterized in that A locking round nut and a stop washer for fixing are arranged on the lower side of the tapered roller bearing (5).

4. The low-speed direct-drive permanent-magnet motor for a pneumatic flotation machine according to claim 1, characterized in that An auxiliary plate (21) is arranged on the outer side of the rotor hollow shaft (4), and a plurality of round holes are formed in the side surface of the auxiliary plate (21).

5. The low-speed direct-drive permanent-magnet motor for a pneumatic flotation machine according to claim 1, characterized in that At least two Christensen sealing structures (24) are arranged between the rotary sealing and heat insulation device (8) and the rotor hollow shaft (4).

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