A magnetic levitation centrifuge blower

Abstract

The present invention relates to the field of blowers, and in particular to a magnetic levitation centrifugal blower. The blower includes a casing, a diffuser, a rear end cover, a motor shaft and a magnetic bearing device; the diffuser and the rear end cover are fixed to the front and rear end faces of the casing respectively, and the casing is fixedly provided with a stator seat, a front protective bearing seat, a rear protective bearing seat, a front radial bearing seat, a rear radial bearing seat and an axial bearing seat; the motor shaft is fixedly provided with a blower impeller, and a sealing device is provided between the back of the blower impeller and the end face of the diffuser; there is a first channel between the front protective bearing seat and the diffuser, and the front radial bearing seat is provided with a second channel and a third channel connected to the outside; one end of the first channel is connected to the back of the blower impeller and the end of the sealing device, and the other end of the first channel, the second channel and the third channel are connected in sequence to form a heat dissipation channel. The blower is provided with a heat dissipation channel on the back of the blower impeller to discharge hot air to the outside of the blower, thereby reducing the temperature at the protective bearing to prevent it from being damaged.

Description

Technical Field

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

[0002] A blower is a mechanical device used to transport gas and is widely used in various fields, including metallurgy, chemical industry, fertilizer, petrochemical industry, food, building materials, petroleum, mining, textile, gas station, pneumatic transportation, and sewage treatment. With the development of blower technology, centrifugal blowers based on magnetic levitation technology have emerged. Their energy-saving and high-efficiency performance characteristics offer promising application prospects.

[0003] The Chinese invention patent application (publication number CN113027819A, publication date: 20210625) discloses an active air cooling system and air cooling method for a magnetic levitation centrifugal blower, including a volute, an impeller, a casing, a casing rear cover, a rotor assembly, a motor stator and a magnetic levitation stator assembly. The front end of the casing is connected to the volute, and the rear end is provided with a casing rear cover. The rotor assembly, the motor stator and the magnetic levitation stator assembly are all arranged in the inner cavity of the casing. The impeller is arranged in the volute, and the front end of the rotor assembly is coaxially connected to the impeller. The casing rear cover is provided with an air inlet, and the front end side wall of the casing is provided with an air outlet. The motor stator and the magnetic levitation stator assembly are both provided with ventilation holes that are interconnected, and the air inlet is connected to the air outlet through the air inlet holes of the magnetic levitation stator assembly and the motor stator. This active air cooling system and method does not require external heat dissipation equipment, water cooling pipes or heat exchangers and other external parts. It changes from the previous external passive heat dissipation to internal active heat dissipation, improving the heat dissipation efficiency of the motor rotor while reducing the heat dissipation cost. The heat dissipation system is maintenance-free and highly reliable.

[0004] The existing technology has the following deficiencies: due to the high pressure in the working chamber of the blower impeller, a small amount of hot air will pass through the sealing device between the back of the blower impeller and the diffuser and enter the motor and cannot be discharged; this causes heat accumulation between the blower impeller and the front protective bearing seat, thereby causing the protective bearing to be damaged due to the high temperature. Summary of the Invention

[0005] The purpose of the present invention is to solve the above problems and propose a magnetic levitation centrifugal blower in which a heat dissipation channel is set on the back of the blower impeller to discharge the hot air to the outside of the blower, thereby reducing the temperature of the protective bearing to prevent damage.

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

[0007] A magnetic levitation centrifuge blower comprises a casing, a diffuser, a rear end cover, a motor shaft and a magnetic bearing device; the diffuser and the rear end cover are respectively fixed to the front and rear end faces of the casing, and the casing is fixedly provided with a stator seat, a front protective bearing seat, a rear protective bearing seat, a front radial bearing seat, a rear radial bearing seat and an axial bearing seat; a blower impeller is fixedly provided on the motor shaft, and a sealing device is provided between the back of the blower impeller and the end face of the diffuser; a first channel is provided between the front protective bearing seat and the diffuser, and the front radial bearing seat is provided with a second channel and a third channel connected to the outside; one end of the first channel is connected to the back of the blower impeller and the end of the sealing device, and the other end of the first channel, the second channel and the third channel are connected in sequence to form a heat dissipation channel.

[0008] Preferably, the motor shaft is also fixedly provided with a heat dissipation impeller, and the blower impeller and the heat dissipation impeller are respectively located on the two end surfaces of the motor shaft; the rear end cover is provided with a fourth channel connected to the outside, the casing is provided with an axial fifth channel, and the axial bearing seat is provided with an axial sixth channel; the heat dissipation impeller is located in the fourth channel, and the fourth channel, the inner hole of the casing, the fifth channel, the sixth channel, the second channel and the third channel are connected in sequence to form a second heat dissipation channel.

[0009] Preferably, the heat dissipation impeller is provided with an axially penetrating screw hole, the end face of the motor shaft is provided with a threaded hole, and the screw passes through the screw hole and is screwed into the threaded hole.

[0010] Preferably, the rear radial bearing seat is provided with an axially penetrating seventh channel, and the stator seat is fixedly provided with a motor stator; the motor stator is provided with an axially penetrating stator gap, and the casing is provided with a vent connected to the outside in the radial direction; the fourth channel, the inner hole of the casing, the seventh channel, the stator gap and the vent are connected in sequence to form a third heat dissipation channel.

[0011] Preferably, the rear protective bearing seat is provided with an eighth channel running axially therethrough, and the rear radial bearing seat is also provided with a ninth channel; one end of the ninth channel is connected with the seventh channel, and the other end of the ninth channel is connected with the eighth channel through the inner hole of the rear radial bearing seat; the fourth channel, the inner hole of the casing, the eighth channel, the inner hole of the rear radial bearing seat, the ninth channel, the seventh channel, the stator gap and the vent are connected in sequence to form a fourth heat dissipation channel.

[0012] Preferably, the magnetic bearing device includes a front radial magnetic bearing, a rear radial magnetic bearing and an axial magnetic bearing, which are respectively fixed in the front radial bearing seat, the rear radial bearing seat and the axial bearing seat; a front radial bearing rotor, a rear radial bearing rotor and a thrust plate are fixed on the motor shaft, and the front radial magnetic bearing and the rear radial magnetic bearing correspond to the positions of the front radial bearing rotor and the rear radial bearing rotor respectively, and the limit parts of the axial magnetic bearing are respectively located at the axial ends of the thrust plate.

[0013] Preferably, the axial magnetic bearing is provided with a radially penetrating bearing channel, and the axial bearing seat is provided with a thrust plate channel; one end of the bearing channel is aligned with the radial outer side of the thrust plate, and the other end of the bearing channel is connected to the sixth channel through the thrust plate channel; the bearing channel, thrust plate channel, sixth channel, second channel and third channel are connected in sequence to form a fifth heat dissipation channel.

[0014] Preferably, the front radial bearing seat is provided with a tenth channel along the radial direction, one end of the tenth channel is connected to the inner hole of the front radial bearing seat, and the other end of the tenth channel is connected to the second channel; the tenth channel, the second channel and the third channel are connected to form a sixth heat dissipation channel.

[0015] Preferably, the tenth channel is radially aligned with the third channel.

[0016] Preferably, protective bearings are provided in the front protective bearing seat and the rear protective bearing seat, and the outer rings of the protective bearings are interference fit with the inner holes of the front protective bearing seat and the rear protective bearing seat respectively, and there is a gap between the inner rings of the protective bearings and the outer wall of the motor shaft at the corresponding position.

[0017] The advantages of the magnetic suspension centrifuge blower using the above technical solution are:

[0018] After a small amount of hot air passes through the sealing device between the back of the blower impeller and the diffuser and enters the blower, it will flow through the heat dissipation channel formed by the first channel, the second channel and the third channel in sequence, and be discharged from the blower through the third channel; thereby avoiding heat accumulation between the blower impeller and the front protective bearing seat, reducing the temperature of the protective bearing to prevent its damage, and extending the service life of the protective bearing. 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 heat dissipation channel.

[0021] Figure 3 Schematic diagram of the structure of the seventh channel and the ninth channel.

[0022] 20-Sealing device. DETAILED DESCRIPTION

[0023] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0024] Example 1

[0025] like Figure 1-3A magnetic levitation centrifugal blower is shown, which includes a casing 1, a diffuser 2, a rear end cover 3, a motor shaft 4 and a magnetic bearing device 5; the diffuser 2 and the rear end cover 3 are respectively fixed to the front and rear end faces of the casing 1, and the casing 1 is fixedly provided with a stator seat 11, a front protective bearing seat 12, a rear protective bearing seat 13, a front radial bearing seat 14, a rear radial bearing seat 15 and an axial bearing seat 16; the motor shaft 4 is fixedly provided with a blower impeller 41, and a sealing device is provided between the back of the blower impeller 41 and the end face of the diffuser 2; a first channel 61 is provided between the front protective bearing seat 12 and the diffuser 2, and the front radial bearing seat 14 is provided with a second channel 62 and a third channel 63 connected to the outside; one end of the first channel 61 is connected to the back of the blower impeller 41 and the end of the sealing device, and the other end of the first channel 61, the second channel 62 and the third channel 63 are connected in sequence to form a heat dissipation channel. In this manner, a small amount of hot air enters the blower through the sealing device between the back of the blower impeller and the diffuser, and then flows through the heat dissipation channel formed by the first channel 61, the second channel 62 and the third channel 63 in sequence, and is discharged from the blower through the third channel 63; thereby avoiding heat accumulation between the blower impeller 41 and the front protective bearing seat 12, reducing the temperature of the protective bearing to prevent damage thereto, and extending the service life of the protective bearing.

[0026] The motor shaft 4 is also fixed with a heat dissipation impeller 42, and the blower impeller 41 and the heat dissipation impeller 42 are respectively located on the two end surfaces of the motor shaft 4; the rear end cover 3 is provided with a fourth channel 71 connected to the outside, the casing 1 is provided with an axial fifth channel 72, and the axial bearing seat 16 is provided with an axial sixth channel 73; the heat dissipation impeller 42 is located in the fourth channel 71, and the fourth channel 71, the inner hole of the casing 1, the fifth channel 72, the sixth channel 73, the second channel 62 and the third channel 63 are connected in sequence to form a second heat dissipation channel to cool the rear end protective bearing, the rear radial magnetic bearing, the motor stator, the axial magnetic bearing and the front radial magnetic bearing.

[0027] The heat dissipation impeller 42 is provided with an axially penetrating screw hole, and the end surface of the motor shaft 4 is provided with a threaded hole. The screw passes through the screw hole and is screwed into the threaded hole to fix the heat dissipation impeller 42 to the end surface of the motor shaft 4.

[0028] The rear radial bearing seat 15 is provided with an axially penetrating seventh channel 81, and the stator seat 11 is fixedly provided with a motor stator 17; the motor stator 17 is provided with an axially penetrating stator gap, and the casing 1 is provided with a vent 18 radially connected to the outside; the fourth channel 71, the inner hole of the casing 1, the seventh channel 81, the stator gap and the vent 18 are connected in sequence to form a third heat dissipation channel to cool the rear end protective bearing, the rear radial magnetic bearing and the motor stator.

[0029] The rear protective bearing seat 13 is provided with an eighth channel 19 running axially therethrough, and the rear radial bearing seat 15 is also provided with a ninth channel 91; one end of the ninth channel 91 is connected with the seventh channel 81, and the other end of the ninth channel 91 is connected with the eighth channel 19 through the inner hole of the rear radial bearing seat 15; the fourth channel 71, the inner hole of the casing 1, the eighth channel 19, the inner hole of the rear radial bearing seat 15, the ninth channel 91, the seventh channel 81, the stator gap and the vent 18 are connected in sequence to form a fourth heat dissipation channel to cool the rear end protective bearing, the rear radial magnetic bearing and the motor stator.

[0030] The magnetic bearing device 5 includes a front radial magnetic bearing 51, a rear radial magnetic bearing 52, and an axial magnetic bearing 53. The front radial magnetic bearing 51, the rear radial magnetic bearing 52, and the axial magnetic bearing 53 are respectively fixed in the front radial bearing seat 14, the rear radial bearing seat 15, and the axial bearing seat 16. The motor shaft 4 is fixedly provided with a front radial bearing rotor, a rear radial bearing rotor, and a thrust plate 43. The front radial magnetic bearing 51 and the rear radial magnetic bearing 52 correspond to the positions of the front radial bearing rotor and the rear radial bearing rotor, respectively. The limiting portions of the axial magnetic bearing 53 are respectively located at the axial ends of the thrust plate 43. The front radial magnetic bearing 51 and the rear radial magnetic bearing 52 radially support the motor shaft 4 by supporting the front radial bearing rotor and the rear radial bearing rotor. The limiting portion of the axial magnetic bearing 53 axially limits the motor shaft 4 by controlling the axial position of the thrust plate 43.

[0031] The axial magnetic bearing 53 is provided with a radially penetrating bearing channel 54, and the axial bearing seat 16 is provided with a thrust plate channel 161; one end of the bearing channel 54 is aligned with the radial outer side of the thrust plate 43, and the other end of the bearing channel 54 is connected to the sixth channel 73 through the thrust plate channel 161; the bearing channel 54, the thrust plate channel 161, the sixth channel 73, the second channel 62 and the third channel 63 are connected in sequence to form a fifth heat dissipation channel to cool the thrust plate 43.

[0032] The front radial bearing seat 14 is provided with a tenth radial channel 141. One end of the tenth channel 141 is connected to the inner hole of the front radial bearing seat 14, and the other end of the tenth channel 141 is connected to the second channel 62. The tenth channel 141, the second channel 62, and the third channel 63 are connected to form a sixth heat dissipation channel, thereby cooling the front radial magnetic bearing 51. The tenth channel 141 is radially aligned with the third channel 63.

[0033] A protective bearing 10 is provided in both the front protective bearing seat 12 and the rear protective bearing seat 13. The outer ring of the protective bearing 10 is interference fit with the inner hole of the front protective bearing seat 12 and the rear protective bearing seat 13, respectively. There is a gap between the inner ring of the protective bearing 10 and the outer wall of the motor shaft 4 at the corresponding position. When the equipment suddenly loses power or shuts down, the front radial magnetic bearing 51, the rear radial magnetic bearing 52 and the axial magnetic bearing 53 lose their magnetic force and cannot support and limit the motor shaft 4. At this time, the motor shaft 4 falls and contacts the inner ring of the protective bearing 10 and is supported by the protective bearing 10; thereby preventing the motor shaft 4 from suddenly falling when the motor suddenly loses power or shuts down, causing damage to important parts such as the front radial magnetic bearing 51, the rear radial magnetic bearing 52 and the axial magnetic bearing 53.

Claims

1. A magnetic levitation centrifuge blower, characterized in that: The blower comprises a casing (1), a diffuser (2), a rear end cover (3), a motor shaft (4) and a magnetic bearing device (5); the diffuser (2) and the rear end cover (3) are respectively fixed to the front and rear end surfaces of the casing (1); the casing (1) is fixedly provided with a stator seat (11), a front protective bearing seat (12), a rear protective bearing seat (13), a front radial bearing seat (14), a rear radial bearing seat (15) and an axial bearing seat (16); the motor shaft (4) is fixedly provided with a blower impeller (41); A sealing device is provided between the back of the impeller (41) and the end face of the diffuser (2); a first channel (61) is provided between the front protective bearing seat (12) and the diffuser (2); a second channel (62) and a third channel (63) communicating with the outside are provided on the front radial bearing seat (14); one end of the first channel (61) is connected to the back of the blower impeller (41) and the end of the sealing device, and the other end of the first channel (61), the second channel (62) and the third channel (63) are connected in sequence to form a heat dissipation channel.

2. A magnetic levitation centrifuge blower according to claim 1, characterized in that: The motor shaft (4) is also fixedly provided with a heat dissipation impeller (42), and the blower impeller (41) and the heat dissipation impeller (42) are respectively located at the two end surfaces of the motor shaft (4); the rear end cover (3) is provided with a fourth channel (71) connected to the outside, the housing (1) is provided with an axial fifth channel (72), and the axial bearing seat (16) is provided with an axial sixth channel (73); the heat dissipation impeller (42) is located in the fourth channel (71), and the fourth channel (71), the inner hole of the housing (1), the fifth channel (72), the sixth channel (73), the second channel (62) and the third channel (63) are sequentially connected to form a second heat dissipation channel.

3. A magnetic levitation centrifuge blower according to claim 2, characterized in that: The heat dissipation impeller (42) is provided with an axially penetrating screw hole, and the end surface of the motor shaft (4) is provided with a threaded hole, through which a screw passes and is screwed into the threaded hole.

4. The magnetic levitation centrifuge blower according to claim 2, characterized in that: The rear radial bearing seat (15) is provided with an axially penetrating seventh channel (81), and a motor stator (17) is fixedly provided in the stator seat (11); the motor stator (17) is provided with an axially penetrating stator gap, and the housing (1) is provided with a vent (18) radially communicating with the outside; the fourth channel (71), the inner hole of the housing (1), the seventh channel (81), the stator gap, and the vent (18) are sequentially connected to form a third heat dissipation channel.

5. The magnetic levitation centrifuge blower according to claim 2, characterized in that: The rear protective bearing seat (13) is provided with an eighth channel (19) extending axially therethrough, and the rear radial bearing seat (15) is further provided with a ninth channel (91); one end of the ninth channel (91) is connected to the seventh channel (81), and the other end of the ninth channel (91) is connected to the eighth channel (19) through the inner hole of the rear radial bearing seat (15); the fourth channel (71), the inner hole of the housing (1), the eighth channel (19), the inner hole of the rear radial bearing seat (15), the ninth channel (91), the seventh channel (81), the stator gap and the vent (18) are connected in sequence to form a fourth heat dissipation channel.

6. The magnetic levitation centrifuge blower according to claim 1, characterized in that: The magnetic bearing device (5) comprises a front radial magnetic bearing (51), a rear radial magnetic bearing (52) and an axial magnetic bearing (53), wherein the front radial magnetic bearing (51), the rear radial magnetic bearing (52) and the axial magnetic bearing (53) are respectively fixed in the front radial bearing seat (14), the rear radial bearing seat (15) and the axial bearing seat (16); a front radial bearing rotor, a rear radial bearing rotor and a thrust plate (43) are fixedly arranged on the motor shaft (4), wherein the front radial magnetic bearing (51) and the rear radial magnetic bearing (52) correspond to the positions of the front radial bearing rotor and the rear radial bearing rotor, respectively, and the limiting parts of the axial magnetic bearing (53) are respectively located at the axial ends of the thrust plate (43).

7. A magnetic levitation centrifuge blower according to claim 2 or 6, characterized in that: The axial magnetic bearing (53) is provided with a radially penetrating bearing channel (54), and the axial bearing seat (16) is provided with a thrust plate channel (161); one end of the bearing channel (54) is aligned with the radial outer side of the thrust plate (43), and the other end of the bearing channel (54) is connected to the sixth channel (73) through the thrust plate channel (161); the bearing channel (54), the thrust plate channel (161), the sixth channel (73), the second channel (62) and the third channel (63) are connected in sequence to form a fifth heat dissipation channel.

8. The magnetic levitation centrifuge blower according to claim 1, characterized in that: The front radial bearing seat (14) is provided with a tenth channel (141) along the radial direction, one end of the tenth channel (141) is connected to the inner hole of the front radial bearing seat (14), and the other end of the tenth channel (141) is connected to the second channel (62); the tenth channel (141), the second channel (62) and the third channel (63) are connected to form a sixth heat dissipation channel.

9. The magnetic levitation centrifuge blower according to claim 8, characterized in that: The tenth channel (141) is radially aligned with the third channel (63).

10. The magnetic levitation centrifuge blower according to claim 1, characterized in that: A protective bearing (10) is provided in each of the front protective bearing seat (12) and the rear protective bearing seat (13). The outer ring of the protective bearing (10) is interference-fitted with the inner holes of the front protective bearing seat (12) and the rear protective bearing seat (13), respectively. A gap exists between the inner ring of the protective bearing (10) and the outer wall of the motor shaft (4) at the corresponding position.

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