A heat dissipation channel of a magnetic levitation blower

Abstract

The present invention relates to the field of magnetic levitation blowers, and in particular to a heat dissipation channel of a magnetic levitation blower. The blower includes a motor barrel, a front bearing seat, a rear bearing seat and a motor shaft housing; the motor shaft is fixedly provided with a motor rotor; the motor rotor includes silicon steel sheets, magnetic steel, a front rotor magnetic steel seat and a rear rotor magnetic steel seat; the rear bearing seat is provided with a plurality of first channels running axially through, and the rear rotor magnetic steel seat is provided with a second channel and a third channel; the motor shaft is provided with a fourth channel running axially through, and the front rotor magnetic steel seat is provided with a fifth channel; the silicon steel sheet is provided with a plurality of sixth channels running axially through, and the motor barrel is provided with a plurality of seventh channels running radially through; the first channel, the second channel, the fourth channel, the fifth channel, the sixth channel, the internal gap of the motor barrel and the seventh channel are connected in sequence to form a heat dissipation channel. The heat dissipation channel transforms a single-layer cooling channel into a multi-layer bent cooling channel, further improving the cooling effect on the rotor part.

Description

Technical Field

[0001] The present invention relates to the field of magnetic suspension blowers, and in particular to a heat dissipation channel of a magnetic suspension blower. Background Art

[0002] A magnetic levitation blower is a type of turbine equipment that utilizes magnetic bearings. Its main structure is that the blower impeller is directly mounted on the extended end of a rotary shaft, while the rotor is vertically suspended on active magnetic bearings. This single-unit high-speed centrifugal blower is directly driven by a high-speed motor and regulated by a frequency converter. This type of blower utilizes an integrated design, offering energy-saving, high cooling efficiency, and low noise levels. It is currently widely used in factories.

[0003] A Chinese utility model patent application (publication number CN209398592U, publication date: June 4, 2014) discloses a magnetic levitation blower, comprising a motor, a cooling system, and a load pipe. The cooling system is disposed on the blower motor, and the load pipe is installed at the blower outlet. The load pipe is connected to the exhaust port of the cooling system. The magnetic levitation blower proposed in this utility model optimizes the structure of the magnetic levitation blower, fully utilizes energy, introduces the gas generated by the cooling system into the load pipe, and integrates it with the airflow discharged by the blower itself, converting all of it into compressed gas required by the load and utilizing it, thereby improving the utilization rate of energy consumption and effectively achieving energy-saving optimization.

[0004] The existing technology has the following deficiencies: when a traditional centrifugal blower cools the rotor system, a single-layer axially penetrating channel is generally provided on the stacked silicon steel sheets, and then external cooling gas is passed into the channel to cool the rotor system; in this method, the length of the single-layer axially penetrating cooling channel is relatively short, and when the diameter of the silicon steel sheet is large, its radial thickness is also large. Only the portion of the silicon steel sheet that is radially close to the single-layer cooling channel can be cooled, and the portion of the silicon steel sheet that is radially far from the single-layer cooling channel is not easy to transfer its own heat to the single-layer cooling channel; thus, the cooling effect of the silicon steel sheet is poor, the temperature of the blower is increased, and it is not conducive to protecting the internal parts of the blower. Summary of the Invention

[0005] The purpose of the present invention is: to address the above-mentioned problems, it is proposed to provide an axially penetrating fourth channel and sixth channel on the motor shaft and the silicon steel sheet respectively, and the two axial channels are connected by a fifth channel, thereby converting a single-layer cooling channel into a multi-layer bent cooling channel, thereby increasing the length of the cooling channel; at the same time, the channel can divide the rotor part with a larger radial thickness into multiple layers of smaller radial thickness parts for cooling, thereby further improving the cooling effect of the rotor part to provide a heat dissipation channel for a magnetic levitation blower.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0007] A heat dissipation channel of a magnetic levitation blower, the blower includes a motor barrel, a front bearing seat, a rear bearing seat, a motor shaft, an impeller and a volute; the inner wall of the motor barrel is fixedly embedded with a motor stator, and the motor shaft is fixedly provided with a motor rotor corresponding to the position of the motor stator; the motor rotor includes silicon steel sheets, magnetic steel, a front rotor magnetic steel seat and a rear rotor magnetic steel seat; a plurality of silicon steel sheets are fixedly sleeved on the outer wall of the motor shaft and are aligned and stacked in the axial direction, and the front rotor magnetic steel seat and the rear rotor magnetic steel seat are fixedly sleeved on the outer wall of the motor shaft and are respectively located on the axial two sides of the stacked silicon steel sheets. end; the silicon steel sheet is provided with a magnetic steel hole, and a plurality of magnets are fixedly embedded in the magnetic steel hole; the rear bearing seat is provided with a plurality of first channels running axially therethrough, and the rear rotor magnetic steel seat is provided with a second channel and a third channel; the motor shaft is provided with a fourth channel running axially therethrough, and the front rotor magnetic steel seat is provided with a fifth channel; the silicon steel sheet is provided with a plurality of sixth channels running axially therethrough, and the motor barrel is provided with a plurality of seventh channels running radially therethrough; the first channel, the second channel, the fourth channel, the fifth channel, the sixth channel, the internal gap of the motor barrel and the seventh channel are connected in sequence to form a heat dissipation channel.

[0008] Preferably, the magnetic levitation blower is also provided with a bearing fixing block; the motor shaft is provided with a rotor bearing hole along the axial direction, the bearing fixing block is fixed on the rear bearing seat and is located in the rotor bearing hole; the inner wall of the rotor bearing hole is fixedly provided with a radial rotor magnet, and the bearing fixing block is fixedly provided with a radial stator magnet, the position of the radial stator magnet corresponds to that of the radial rotor magnet and the magnetic poles of the relative surfaces of the two are opposite.

[0009] Preferably, the motor shaft is further provided with a rotor channel, and the front bearing seat is provided with a radially penetrating bearing seat channel; the first channel, the rotor bearing hole, the rotor channel and the bearing seat channel are connected in sequence to form a second heat dissipation channel.

[0010] Preferably, the rear rotor magnetic steel seat is further provided with an eighth channel; the first channel, the eighth channel, the sixth channel and the seventh channel are connected in sequence to form a third heat dissipation channel.

[0011] Preferably, the motor shaft is fixedly provided with a front rotor magnet and a rear rotor magnet on both sides of the front and rear axes, and the front bearing seat and the rear bearing seat are fixedly provided with a front stator magnet and a rear stator magnet respectively; the positions of the front stator magnet and the front rotor magnet correspond to each other and the magnetic poles of the relative surfaces of the two are opposite, and the positions of the rear stator magnet and the rear rotor magnet correspond to each other and the magnetic poles of the relative surfaces of the two are opposite.

[0012] Preferably, a front stator magnetic steel seat is fixedly provided on the inner side surface of the front bearing seat, a front magnetic steel groove is provided on the inner side of the front stator magnetic steel seat, and the front stator magnet is fixedly embedded in the front magnetic steel groove; a rear stator magnetic steel seat is fixedly provided on the inner side surface of the rear bearing seat, a rear magnetic steel groove is provided on the inner side of the rear stator magnetic steel seat, and the rear stator magnet is fixedly embedded in the rear magnetic steel groove.

[0013] Preferably, the outer sides of the front stator magnetic steel seat and the rear stator magnetic steel seat are provided with threaded holes, and the front bearing seat and the rear bearing seat are provided with axially penetrating screw holes; the magnetic levitation blower is also provided with locking screws and locking nuts, and a plurality of locking screws respectively pass through the screw holes of the front bearing seat and the rear bearing seat and are respectively screwed into the threaded holes of the front stator magnetic steel seat and the rear stator magnetic steel seat; a plurality of locking nuts are respectively screwed with the locking screws and the inner surfaces of the plurality of locking nuts are respectively fitted to the outer sides of the front bearing seat and the rear bearing seat.

[0014] Preferably, the outer wall of the motor barrel is provided with heat dissipation ribs, which are used to dissipate heat from the motor barrel.

[0015] Preferably, a fairing is provided at the air inlet end of the impeller, and the fairing is used to rectify the gas at the air inlet end of the volute to improve the air intake efficiency.

[0016] Preferably, the back of the impeller is provided with outwardly protruding reinforcing ribs, and the front bearing seat is provided with a labyrinth seal; the radial outer surface of the reinforcing ribs and the labyrinth seal form a labyrinth structure for reducing gas emissions from the impeller outlet end.

[0017] The advantages of the heat dissipation channel of a magnetic suspension blower using the above technical solution of the present invention are:

[0018] During operation, the motor stator is energized to drive the motor rotor to rotate and then drive the motor shaft to rotate. The external cooling air enters the blower along the heat dissipation channel to cool it and is then discharged along the seventh channel to complete the blower cooling process. In this method, the fourth channel and the sixth channel are both axially distributed cooling channels, and the two are connected through the fifth channel. That is, in this cooling method, multiple layers of curved cooling channels are used in the radial direction for cooling, which increases the length of the cooling channel. Moreover, when the radial thickness of the rotor part is large, the multi-layer cooling channel can divide the rotor part with larger radial thickness into multiple layers of smaller radial thickness parts for cooling, thereby further improving the cooling effect of the rotor part. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention.

[0020] Figure 2 Schematic diagram of the structure of the magnetic levitation blower.

[0021] Figure 3 It is a structural diagram of the front bearing seat.

[0022] Figure 4 It is a structural diagram of the rear bearing seat.

[0023] Figure 5 Schematic diagram of the blower rotor system.

[0024] Figure 6 、 Figure 7 This is a schematic diagram of the motor rotor structure.

[0025] Figure 8 、 Figure 9 It is a structural diagram of the motor cylinder.

[0026] Figure 10 Schematic diagram of the impeller structure.

[0027] Figure 11 、 Figure 12 This is a schematic diagram of the motor shaft structure.

[0028] Figure 13 Schematic diagram of the structure of the radial rotor magnetic field.

[0029] Figure 14-16 This is a structural diagram of the front rotor magnetic steel seat.

[0030] Figure 17-19 This is a schematic diagram of the structure of the rear rotor magnetic steel seat.

[0031] Figure 20 Schematic diagram of the structure of the bearing fixing block.

[0032] Figure 21 Schematic diagram of the structure of the radial stator magnetic field. DETAILED DESCRIPTION

[0033] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0034] Example 1

[0035] like Figure 1 、 Figure 2 、 Figure 5-7The heat dissipation channel of a magnetic levitation blower shown in the figure includes a motor barrel 1, a front bearing seat 2, a rear bearing seat 3, a motor shaft 4, an impeller 5 and a volute 6; a motor stator 11 is fixedly embedded in the inner wall of the motor barrel 1, and a motor rotor 41 corresponding to the position of the motor stator 11 is fixedly provided on the motor shaft 4; the motor rotor 41 includes a silicon steel sheet 46, a magnetic steel 47, a front rotor magnetic steel seat 48 and a rear rotor magnetic steel seat 49; a plurality of silicon steel sheets 46 are fixedly sleeved on the outer wall of the motor shaft 4 and are stacked in axial alignment, and the front rotor magnetic steel seat 48 and the rear rotor magnetic steel seat 49 are fixedly sleeved on the outer wall of the motor shaft 4 and are respectively located at the axial ends of the stacked silicon steel sheets 46 ; The silicon steel sheet 46 is provided with a magnetic steel hole, and a plurality of magnetic steels 47 are fixedly embedded in the magnetic steel hole; the rear bearing seat 3 is provided with a plurality of first channels 81 that penetrate axially, and the rear rotor magnetic steel seat 49 is provided with a second channel 82 and a third channel 83; the motor shaft 4 is provided with a fourth channel 84 that penetrates axially, and the front rotor magnetic steel seat 48 is provided with a fifth channel 85; the silicon steel sheet 46 is provided with a plurality of sixth channels 86 that penetrate axially, and the motor barrel 1 is provided with a plurality of seventh channels 87 that penetrate radially; the first channel 81, the second channel 82, the fourth channel 84, the fifth channel 85, the sixth channel 86, the internal gap of the motor barrel 1 and the seventh channel 87 are connected in sequence to form a heat dissipation channel. During operation, the motor stator 11 is energized to drive the motor rotor 41 to rotate, thereby driving the motor shaft 4 to rotate. The external cooling air enters the blower along the heat dissipation channel to cool it and is then discharged along the seventh channel 87 to complete the blower cooling process; and in this method, the fourth channel 84 and the sixth channel 86 are both axially distributed cooling channels, and the two are connected through the fifth channel 85; that is, in this cooling method, multiple layers of curved cooling channels are used in the radial direction for cooling, which increases the length of the cooling channel; and when the radial thickness of the rotor part is large, the multi-layer cooling channel can divide the rotor part with a larger radial thickness into multiple layers of smaller radial thickness parts for cooling, thereby further improving the cooling effect of the rotor part.

[0036] The magnetic levitation blower is also provided with a bearing fixing block 7; the motor shaft 4 is provided with a rotor bearing hole 42 along the axial direction, the bearing fixing block 7 is fixed on the rear bearing seat 3 and is located in the rotor bearing hole 42; a radial rotor magnet 43 is fixedly provided on the inner wall of the rotor bearing hole 42, and a radial stator magnet 71 is fixedly provided on the bearing fixing block 7, the radial stator magnet 71 corresponds to the position of the radial rotor magnet 43 and the magnetic poles of the relative surfaces of the two are opposite.

[0037] The motor shaft 4 is further provided with a rotor channel 40, and the front bearing seat 2 is provided with a radially penetrating bearing seat channel 26; the first channel 81, the rotor bearing hole 42, the rotor channel 40 and the bearing seat channel 26 are connected in sequence to form a second heat dissipation channel.

[0038] The rear rotor magnetic steel seat 49 is further provided with an eighth channel 88; the first channel 81, the eighth channel 88, the sixth channel 86 and the seventh channel 87 are connected in sequence to form a third heat dissipation channel.

[0039] The motor shaft 4 is fixedly provided with a front rotor magnet 44 and a rear rotor magnet 45 on either side of the front and rear axial directions, respectively. The front stator magnet 21 and the rear stator magnet 31 are fixedly provided on the front bearing seat 2 and the rear bearing seat 3, respectively. The front stator magnet 21 and the front rotor magnet 44 are positioned in a corresponding manner, and the magnetic poles of their opposing surfaces are opposite. The rear stator magnet 31 and the rear rotor magnet 45 are positioned in a corresponding manner, and the magnetic poles of their opposing surfaces are opposite. During operation, the motor stator 11 is energized to drive the motor rotor 41 to rotate, thereby driving the motor shaft 4 to rotate. The front stator magnet 21 and the rear stator magnet 31 respectively control the positions of the front rotor magnet 44 and the rear rotor magnet 45 through magnetic force, thereby controlling the axial position of the motor shaft 4. The radial stator magnet 71 controls the radial position of the motor shaft 4 by controlling the position of the radial rotor magnet 43. At the same time, the rotation of the motor shaft 4 drives the impeller 5 to rotate, thereby compressing the external air and completing the operation of the magnetic levitation blower. In this method, the passive magnetic bearings are divided into three pairs of six annular magnets, where the active surfaces of the two magnets in each bearing group are of the same polarity, generating a repulsive force to constrain the displacement of the six degrees of freedom of the rotor. The support surface between the radial stator magnet 71 and the radial rotor magnet 43 almost supports the entire rotor shaft system, providing a large supporting force, and the stiffness of the bearing is much better than other types of bearings. Moreover, this method adopts the form of passive magnetic levitation bearings in both axial and radial directions, directly controlling the motor shaft through the magnetic force of the magnets, without the need for lubrication with lubricating oil, and reducing maintenance steps; at the same time, the passive magnetic levitation bearing does not require the use of sensors, thereby reducing the price of the magnetic bearing, simplifying the structure of the blower, and increasing the stability of the system.

[0040] like Figure 3 、 Figure 4 As shown, a front stator magnetic steel seat 22 is fixedly provided on the inner side surface of the front bearing seat 2, a front magnetic steel groove 23 is provided on the inner side of the front stator magnetic steel seat 22, and the front stator magnetic steel 21 is fixedly embedded in the front magnetic steel groove 23; a rear stator magnetic steel seat 32 is fixedly provided on the inner side surface of the rear bearing seat 3, a rear magnetic steel groove 33 is provided on the inner side of the rear stator magnetic steel seat 32, and the rear stator magnetic steel 31 is fixedly embedded in the rear magnetic steel groove 33.

[0041] The outer sides of the front stator magnetic steel seat 22 and the rear stator magnetic steel seat 32 are both provided with threaded holes 24, and the front bearing seat 2 and the rear bearing seat 3 are both provided with axially penetrating screw holes 34; the magnetic levitation blower is also provided with locking screws and locking nuts, and multiple locking screws pass through the screw holes 34 of the front bearing seat 2 and the rear bearing seat 3 respectively and are screwed into the threaded holes 24 of the front stator magnetic steel seat 22 and the rear stator magnetic steel seat 32 respectively; multiple locking nuts are respectively screwed with the locking screws and the inner surfaces of the multiple locking nuts are respectively attached to the outer sides of the front bearing seat 2 and the rear bearing seat 3. When the actual load of the motor shaft 4 changes, the axial position of the locking screw is adjusted to drive the front stator magnetic steel seat 22 and the rear stator magnetic steel seat 32 to move axially to the corresponding positions respectively, and then the locking screw is tightened with a locking nut; thereby adjusting the distance between the front stator magnetic steel 21 and the front rotor magnetic steel 44 and the distance between the rear stator magnetic steel 31 and the rear rotor magnetic steel 45 to change the size of the repulsive force between the two; so that the repulsive force between the front stator magnetic steel 21 and the front rotor magnetic steel 44 and between the rear stator magnetic steel 31 and the rear rotor magnetic steel 45 meets the actual load of the motor shaft 4.

[0042] like Figure 8 、 Figure 9 As shown, the outer wall of the motor barrel 1 is provided with heat dissipation ribs 12 , which are used to dissipate heat from the motor barrel 1 .

[0043] The air inlet end of the impeller 5 is provided with a fairing 51, which is used to rectify the gas at the air inlet end of the volute 6 to improve the air intake efficiency.

[0044] The back of the impeller 5 is provided with an outwardly protruding reinforcing rib 52, and the front bearing seat 2 is provided with a labyrinth seal 25; the radial outer surface of the reinforcing rib 52 and the labyrinth seal 25 form a labyrinth structure for reducing gas emissions from the outlet end of the impeller 5.

Claims

1. A heat dissipation channel of a magnetic levitation blower, characterized in that: The blower comprises a motor barrel (1), a front bearing seat (2), a rear bearing seat (3), a motor shaft (4), an impeller (5) and a volute (6); a motor stator (11) is fixedly embedded in the inner wall of the motor barrel (1), and a motor rotor (41) corresponding to the position of the motor stator (11) is fixedly provided on the motor shaft (4); the motor rotor (41) comprises a silicon steel sheet (46), a magnetic steel (47), a front rotor magnetic steel seat (48) and a rear rotor magnetic steel seat (49); a plurality of silicon steel sheets (46) are fixedly sleeved on the outer wall of the motor shaft (4) and are stacked in an axially aligned manner, and the front rotor magnetic steel seat (48) and the rear rotor magnetic steel seat (49) are fixedly sleeved on the outer wall of the motor shaft (4) and are respectively located at the axial ends of the stacked silicon steel sheets (46); the silicon steel sheets (46) are arranged A magnetic steel hole is provided, and a plurality of magnetic steels (47) are fixedly embedded in the magnetic steel hole; the rear bearing seat (3) is provided with a plurality of first channels (81) extending axially therethrough, and the rear rotor magnetic steel seat (49) is provided with a second channel (82) and a third channel (83); the motor shaft (4) is provided with a fourth channel (84) extending axially therethrough, and the front rotor magnetic steel seat (48) is provided with a fifth channel (85); the silicon steel sheet (46) is provided with a plurality of sixth channels (86) extending axially therethrough, and the motor barrel (1) is provided with a plurality of seventh channels (87) extending radially therethrough; the first channel (81), the second channel (82), the fourth channel (84), the fifth channel (85), the sixth channel (86), the internal gap of the motor barrel (1) and the seventh channel (87) are sequentially connected to form a heat dissipation channel.

2. The heat dissipation channel of a magnetic levitation blower according to claim 1, characterized in that: The magnetic levitation blower is further provided with a bearing fixing block (7); the motor shaft (4) is provided with a rotor bearing hole (42) along the axial direction; the bearing fixing block (7) is fixed on the rear bearing seat (3) and is located in the rotor bearing hole (42); a radial rotor magnet (43) is fixedly provided on the inner wall of the rotor bearing hole (42); a radial stator magnet (71) is fixedly provided on the bearing fixing block (7); the radial stator magnet (71) corresponds to the radial rotor magnet (43) in position, and the magnetic poles of the relative surfaces of the two are opposite.

3. The heat dissipation channel of a magnetic levitation blower according to claim 2, characterized in that: The motor shaft (4) is further provided with a rotor channel (40), and the front bearing seat (2) is provided with a radially penetrating bearing seat channel (26); the first channel (81), the rotor bearing hole (42), the rotor channel (40), and the bearing seat channel (26) are sequentially connected to form a second heat dissipation channel.

4. The heat dissipation channel of a magnetic levitation blower according to claim 1, characterized in that: The rear rotor magnetic steel seat (49) is further provided with an eighth channel (88); the first channel (81), the eighth channel (88), the sixth channel (86) and the seventh channel (87) are sequentially connected to form a third heat dissipation channel.

5. The heat dissipation channel of a magnetic levitation blower according to claim 1, characterized in that: The motor shaft (4) is fixedly provided with a front rotor magnet (44) and a rear rotor magnet (45) on both sides of the front and rear axial directions, respectively; the front bearing seat (2) and the rear bearing seat (3) are fixedly provided with a front stator magnet (21) and a rear stator magnet (31) respectively; the positions of the front stator magnet (21) and the front rotor magnet (44) correspond to each other and the magnetic poles of the relative surfaces thereof are opposite, and the positions of the rear stator magnet (31) and the rear rotor magnet (45) correspond to each other and the magnetic poles of the relative surfaces thereof are opposite.

6. The heat dissipation channel of a magnetic levitation blower according to claim 5, characterized in that: A front stator magnetic steel seat (22) is fixedly provided on the inner side surface of the front bearing seat (2), a front magnetic steel groove (23) is provided on the inner side of the front stator magnetic steel seat (22), and the front stator magnetic steel (21) is fixedly embedded in the front magnetic steel groove (23); a rear stator magnetic steel seat (32) is fixedly provided on the inner side surface of the rear bearing seat (3), a rear magnetic steel groove (33) is provided on the inner side of the rear stator magnetic steel seat (32), and the rear stator magnetic steel (31) is fixedly embedded in the rear magnetic steel groove (33).

7. The heat dissipation channel of a magnetic levitation blower according to claim 6, characterized in that: The outer side surfaces of the front stator magnetic steel seat (22) and the rear stator magnetic steel seat (32) are both provided with threaded holes (24), and the front bearing seat (2) and the rear bearing seat (3) are both provided with axially penetrating screw holes (34); the magnetic levitation blower is also provided with locking screws and locking nuts, and the plurality of locking screws respectively pass through the screw holes (34) of the front bearing seat (2) and the rear bearing seat (3) and are respectively screwed into the threaded holes (24) of the front stator magnetic steel seat (22) and the rear stator magnetic steel seat (32); the plurality of locking nuts are respectively screwed into the locking screws and the inner surfaces of the plurality of locking nuts are respectively fitted to the outer side surfaces of the front bearing seat (2) and the rear bearing seat (3).

8. The heat dissipation channel of a magnetic levitation blower according to claim 1, characterized in that: The outer wall of the motor barrel (1) is provided with heat dissipation ribs (12), and the heat dissipation ribs (12) are used to dissipate heat from the motor barrel (1).

9. The heat dissipation channel of a magnetic levitation blower according to claim 1, characterized in that: The air inlet end of the impeller (5) is provided with a fairing (51), and the fairing (51) is used to rectify the gas at the air inlet end of the volute (6) to improve the air intake efficiency.

10. The heat dissipation channel of a magnetic levitation blower according to claim 1, characterized in that: The back of the impeller (5) is provided with an outwardly protruding reinforcing rib (52), and the front bearing seat (2) is provided with a labyrinth seal (25); the radial outer surface of the reinforcing rib (52) and the labyrinth seal (25) form a labyrinth structure for reducing gas emissions from the outlet end of the impeller (5).

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