1. A self-cooling air suspension blower is characterized by comprising a motor outer cylinder (1), a motor inner cylinder (2), a first end cover (3), a second end cover (4), a motor rotating shaft (5), an air bearing device (6), an impeller (7), a volute (8) and an air inlet end cover (9); the motor inner cylinder (2) is embedded and fixed in the motor outer cylinder (1), and the first end cover (3) and the second end cover (4) are respectively fixed at two ends of the motor outer cylinder (1); the air inlet end cover (9) is fixed on the second end cover (4), and the air bearing device (6) is used for supporting and limiting the motor rotating shaft (5) in the radial direction and the axial direction; the air inlet end cover (9) is provided with a first channel (11) communicated with the outside, and the second end cover (4) is provided with a second channel (12); a motor stator (90) is fixedly embedded in the inner side of the motor inner cylinder (2), a motor rotor (10) is arranged on the motor rotating shaft (5), the motor stator (90) and the motor rotor (10) are oppositely arranged, and a gap exists between the motor stator and the motor rotor in the radial direction to form a third channel (13); the motor inner cylinder (2) is provided with a fourth channel (14), and the first end cover (3) is provided with a fifth channel (15); the first channel (11), the second channel (12), the third channel (13) and the fifth channel (15) are communicated in sequence, and the first channel (11), the second channel (12), the fourth channel (14) and the fifth channel (15) are communicated in sequence; the volute (8) is provided with an air inlet channel (16) and an air exhaust channel (17), and the fifth channel (15), the air inlet channel (16), the impeller (7) cavity and the air exhaust channel (17) are communicated in sequence.

2. A self-cooling air suspension blower as claimed in claim 1, wherein the motor shaft (5) comprises a first shaft (51), a second shaft (52) and a third shaft (53), the motor rotor (10) is disposed on the first shaft (51), and one end of the second shaft (52) and one end of the third shaft (53) are respectively fixed to two ends of the first shaft (51).

3. A self-cooling air-suspending blower according to claim 1, wherein the air bearing device (6) comprises an air-suspending radial bearing (61) and an air-suspending axial bearing (62); the two air suspension radial bearings (61) are respectively fixed on the first end cover (3) and the second end cover (4), and the two air suspension radial bearings (61) are respectively rotatably connected with the motor rotating shaft (5); the air suspension axial bearing (62) comprises a thrust disc (63) and axial limiting parts (64), the thrust disc (63) is connected with the motor rotating shaft (5), and the two axial limiting parts (64) are respectively located on two axial sides of the thrust disc (63).

4. A self-cooling air suspension blower according to claim 1, characterised in that the second shaft (52) comprises a first shaft section (521), a second shaft section (522), a third shaft section (523) and a fourth shaft section (524); the outer walls of the first shaft section (521) and the fourth shaft section (524) are provided with external threads, and a second boss (54) is arranged at one end, located at the second rotating shaft (52), of the first rotating shaft (51); the second boss (54) is provided with an inner hole with internal threads, and the external threads of the first shaft section (521) and the internal threads of the inner hole of the second boss (54) are screwed to the joint position of the end surface of the inner side of the second shaft section (522) and the end surface of the outer side of the second boss (54).

5. A self-cooling air suspension blower as claimed in claim 3 or 4, characterized in that the second boss (54) is sleeved with a second shaft sleeve (55), and the outer surface of the second shaft sleeve (55) is provided with a PVD coating; the second rotating shaft (52) penetrates through an inner hole of a second shaft sleeve (55), and the outer wall of the second shaft sleeve (55) is rotatably connected with an air suspension radial bearing (61); the second shaft sleeve (55) is provided with a second shaft sleeve boss (551), and the thrust disc (63) is sleeved on the outer wall of the second shaft sleeve boss (551); a thrust disc pressing block (552) is further sleeved on the outer wall of the second shaft sleeve boss (551), and a locking nut (553) is sleeved on the external thread of the fourth shaft section (524); when the locking nut (553) is locked, the second shaft sleeve (55) is axially locked on the second rotating shaft (52), and the thrust disc (63) and the thrust disc pressing block (552) are axially locked on the second shaft sleeve (55).

6. A self-cooling air suspension blower according to claim 1, characterised in that the third shaft (53) comprises a fifth shaft segment (531), a sixth shaft segment (532), a seventh shaft segment (533) and an eighth shaft segment (534); the outer walls of the fifth shaft section (531) and the eighth shaft section (534) are provided with external threads, and a third boss (56) is arranged at one end, located at the third rotating shaft (53), of the first rotating shaft (51); an inner hole with an internal thread is formed in the third boss (56), and the external thread of the five shaft section (531) and the internal thread of the inner hole of the third boss (56) are screwed to the position where the end face of the inner side of the sixth shaft section (532) is attached to the end face of the outer side of the third boss (56).

7. A self-cooling air suspension blower as claimed in claim 3 or 6, characterized in that the outer wall of the third boss (56) is sleeved with a third shaft sleeve (57), and the outer surface of the third shaft sleeve (57) is provided with a PVD coating; the third rotating shaft (53) penetrates through an inner hole of the third shaft sleeve (57), and the outer wall of the third shaft sleeve (57) is rotatably connected with the air suspension radial bearing (61); the third shaft sleeve (57) is provided with a third shaft sleeve boss (571), the impeller (7) is sleeved on the outer wall of the third shaft sleeve boss (571), and a locking nut (553) is sleeved on the external thread of the eighth shaft section (534); when the locking nut (553) is locked, the third shaft sleeve (57) is axially locked on the third rotating shaft (53), and the impeller (7) is axially locked on the third shaft sleeve (57).

8. A self-cooling air suspension blower according to claim 3, wherein the air inlet end cap (9) is provided with a first thrust disk groove (91) on the inside and the second end cap (4) is provided with a second thrust disk groove (41) on the outside; the first thrust disc groove (91) and the second thrust disc groove (41) are oppositely arranged at two ends of the thrust disc (63), and the two axial limiting parts (64) are respectively fixed on the first thrust disc groove (91) and the second thrust disc groove (41).

9. A self-cooling air suspension blower according to claim 1, characterised in that the impeller (7) is a three-dimensional flow impeller.

10. A self-cooling air suspension blower according to claim 1, characterised in that the fifth passage (15) is an annular passage and the radially outer surface of the annular passage is circular and the radially inner surface of the annular passage is conical.

Background

The air suspension centrifugal blower is a new concept blower, and adopts three core high-end technologies of an ultra-high speed direct connection motor, an air suspension bearing and a high-precision single-stage centrifugal impeller, so that a new era of high-efficiency, high-performance, low-noise and low-energy consumption blowers is created.

The Chinese invention patent application (publication No. CN112228361A, published: 20210115) discloses an air suspension centrifugal blower, which comprises a motor, a volute, an impeller shaft, a bearing rotating shaft, an air suspension radial bearing and an air suspension thrust bearing, wherein the front end and the rear end of a motor rotor are respectively in rotary connection with the air suspension radial bearing through the bearing rotating shaft, the bearing rotating shaft positioned at the front end of the motor is in rotary connection with the air suspension thrust bearing through a thrust disc, the friction surfaces of the bearing rotating shaft and the thrust disc are provided with PVD coatings, the friction coefficient of the PVD coatings is less than or equal to 0.1, and the thickness of the PVD coatings is 2-8 mu m; the friction surfaces of the air suspension radial bearing and the air suspension thrust bearing are provided with PTFE coatings, the friction coefficient of the PTFE coatings is less than or equal to 0.05, and the thickness of the PTFE coatings is 0.02 mm-0.05 mm. The invention has the advantages of compact structure, high efficiency, long service life, good stability, high starting and stopping times, low motor temperature rise and the like.

The prior art has the following defects: the rear end of the blower drives the heat dissipation impeller to dissipate heat, and the heat dissipation impeller generates power consumption when rotating; meanwhile, the air inflow of the impeller of the heat dissipation impeller is small, so that the heat dissipation effect of the air blower is poor.

Disclosure of Invention

The purpose of the invention is: aiming at the problems, a heat dissipation channel is arranged in the blower, and a blower impeller of the blower is used for absorbing a large amount of external air to dissipate heat of the blower along the heat dissipation channel; therefore, a heat dissipation impeller is not needed to be arranged, and the heat dissipation effect of the air blower is improved.

In order to achieve the purpose, the invention adopts the following technical scheme:

a self-cooled air suspension blower comprises a motor outer cylinder, a motor inner cylinder, a first end cover, a second end cover, a motor rotating shaft, an air bearing device, an impeller, a volute and an air inlet end cover; the motor inner cylinder is embedded and fixed in the motor outer cylinder, and the first end cover and the second end cover are respectively fixed at two ends of the motor outer cylinder; the air bearing device is used for supporting and limiting the motor rotating shaft in the radial direction and the axial direction; the air inlet end cover is provided with a first channel communicated with the outside, and the second end cover is provided with a second channel; a motor stator is fixedly embedded in the inner side of the motor inner cylinder, a motor rotor is arranged on a motor rotating shaft, the motor stator and the motor rotor are oppositely arranged, and a gap exists between the motor stator and the motor rotor in the radial direction to form a third channel; the motor inner cylinder is provided with a fourth channel, and the first end cover is provided with a fifth channel; the first channel, the second channel, the third channel and the fifth channel are communicated in sequence; the volute is provided with an air inlet channel and an air exhaust channel, and the fifth channel, the air inlet channel, the impeller cavity and the air exhaust channel are communicated in sequence.

Preferably, the motor rotating shaft comprises a first rotating shaft, a second rotating shaft and a third rotating shaft, the motor rotor is arranged on the first rotating shaft, and one end of the second rotating shaft and one end of the third rotating shaft are fixedly connected with two ends of the first rotating shaft respectively.

Preferably, the air bearing means comprises an air-bearing radial bearing and an air-bearing axial bearing; the two air suspension radial bearings are respectively fixed on the first end cover and the second end cover and are respectively rotatably connected with the motor rotating shaft; the air suspension axial bearing comprises a thrust disc and axial limiting parts, the thrust disc is connected with a motor rotating shaft, and the two axial limiting parts are respectively positioned on two axial sides of the thrust disc.

Preferably, the second rotating shaft comprises a first shaft section, a second shaft section, a third shaft section and a fourth shaft section; the outer wall of the first shaft section and the outer wall of the fourth shaft section are both provided with external threads, and a second boss is arranged at one end of the first rotating shaft, which is positioned at the second rotating shaft; the second boss is provided with an inner hole with internal threads, and the external threads of the first shaft section and the internal threads of the inner hole of the second boss are screwed to the position where the end surface of the inner side of the second shaft section is attached to the end surface of the outer side of the second boss.

Preferably, a second shaft sleeve is sleeved on the outer wall of the second boss, and a PVD coating is arranged on the outer surface of the second shaft sleeve; the second rotating shaft penetrates through an inner hole of the second shaft sleeve, and the outer wall of the second shaft sleeve is rotatably connected with the air suspension radial bearing; the second shaft sleeve is provided with a second shaft sleeve boss, and the thrust disc is sleeved on the outer wall of the second shaft sleeve boss; a thrust disc pressing block is further sleeved on the outer wall of the boss of the second shaft sleeve, and a locking nut is sleeved on the external thread of the fourth shaft section; when the locking nut is locked, the second shaft sleeve is axially locked on the second rotating shaft, and the thrust disc pressing block are axially locked on the second shaft sleeve.

Preferably, the third rotating shaft comprises a fifth shaft section, a sixth shaft section, a seventh shaft section and an eighth shaft section; the outer wall of the fifth shaft section and the outer wall of the eighth shaft section are both provided with external threads, and a third boss is arranged at one end of the first rotating shaft, which is positioned at the third rotating shaft; the third boss is provided with an inner hole with internal threads, and the external threads of the five shaft sections and the internal threads of the inner hole of the third boss are screwed to the joint position of the end face of the inner side of the sixth shaft section and the end face of the outer side of the third boss.

Preferably, a third shaft sleeve is sleeved on the outer wall of the third boss, and a PVD coating is arranged on the outer surface of the third shaft sleeve; the third rotating shaft penetrates through an inner hole of the third shaft sleeve, and the outer wall of the third shaft sleeve is rotatably connected with the air suspension radial bearing; the third shaft sleeve is provided with a third shaft sleeve boss, the impeller is sleeved on the outer wall of the third shaft sleeve boss, and a locking nut is sleeved on an external thread of the eighth shaft section; when the locking nut is locked, the third shaft sleeve is axially locked on the third rotating shaft, and the impeller is axially locked on the third shaft sleeve.

Preferably, a first thrust disc groove is formed in the inner side of the air inlet end cover, and a second thrust disc groove is formed in the outer side of the second end cover; the first thrust disc groove and the second thrust disc groove are oppositely arranged at two ends of the thrust disc, and the two axial limiting parts are respectively fixed on the first thrust disc groove and the second thrust disc groove.

Preferably, the impeller is a three-dimensional flow impeller. The fifth passage is an annular passage, and the radially outer surface of the annular passage is circular and the radially inner surface of the annular passage is conical.

The self-cooling air suspension blower adopting the technical scheme has the advantages that:

the air suspension blower is in operation: after the air suspension blower is started, a rotating shaft of the motor drives the impeller to rotate; external air is fed through the tail end air inlet end cover, and is collected to the air inlet channel after cooling the air bearing device, the motor stator and the motor rotor along the first channel, the second channel, the third channel, the fifth channel and the two air channels of the first channel, the second channel, the fourth channel and the fifth channel respectively; the air in the air inlet channel is driven by the impeller to decelerate, change the flow direction and increase the pressure, and then is discharged along the impeller cavity and the air exhaust channel in sequence. In the mode, the heat dissipation of the air suspension blower is realized by sucking external air by the impeller without arranging a heat dissipation impeller; thereby reducing the power consumption generated by the heat dissipation impeller and improving the efficiency of the air suspension blower. Meanwhile, the impeller can blow air, so that the working air volume of the impeller is far greater than that of the heat dissipation impeller; thereby make a large amount of air admission air suspension air-blower inside cool off it, promoted the radiating effect, and then reduced the temperature rise of electric motor rotor and motor stator, promote its life. Moreover, when the air suspension blower works, and air flows inside, a labyrinth shape is formed, and an air flow channel is lengthened; the motor outer barrel is matched with the first end cover and the second end cover to form a relatively sealed space, air flow sound and motor electromagnetic sound can be effectively isolated inside the motor barrel, and working noise is reduced.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a partially enlarged schematic view of the present invention.

Fig. 3 is a partially enlarged schematic view of the present invention.

L-the direction of gas flow.

Detailed Description

The following describes in detail embodiments of the present invention with reference to the drawings.

Example 1

A self-cooling air suspension blower as shown in fig. 1, which comprises a motor outer cylinder 1, a motor inner cylinder 2, a first end cover 3, a second end cover 4, a motor rotating shaft 5, an air bearing device 6, an impeller 7, a volute 8 and an air inlet end cover 9; the motor inner barrel 2 is embedded and fixed in the motor outer barrel 1, and the first end cover 3 and the second end cover 4 are respectively fixed at two ends of the motor outer barrel 1; the air inlet end cover 9 is fixed on the second end cover 4, and the air bearing device 6 is used for supporting and limiting the motor rotating shaft 5 in the radial direction and the axial direction; the air inlet end cover 9 is provided with a first channel 11 communicated with the outside, and the second end cover 4 is provided with a second channel 12; a motor stator 90 is fixedly embedded inside the motor inner cylinder 2, a motor rotor 10 is arranged on the motor rotating shaft 5, the motor stator 90 and the motor rotor 10 are oppositely arranged, and a gap exists between the motor stator 90 and the motor rotor 10 in the radial direction to form a third channel 13; the motor inner cylinder 2 is provided with a fourth channel 14, and the first end cover 3 is provided with a fifth channel 15; the first channel 11, the second channel 12, the third channel 13 and the fifth channel 15 are communicated in sequence, and the first channel 11, the second channel 12, the fourth channel 14 and the fifth channel 15 are communicated in sequence; the volute casing 8 is provided with an air inlet channel 16 and an air exhaust channel 17, and the fifth channel 15, the air inlet channel 16, the impeller 7 cavity and the air exhaust channel 17 are communicated in sequence. The air suspension blower is in operation: after the air suspension blower is started, the motor rotating shaft 5 drives the impeller 7 to rotate; external air is fed through the tail end air inlet end cover 9, and is collected to the air inlet channel 16 after being cooled to the air bearing device 6, the motor stator 90 and the motor rotor 10 along the first channel 11, the second channel 12, the third channel 13, the fifth channel 15, the first channel 11, the second channel 12, the fourth channel 14 and the fifth channel 15; the air in the air inlet channel 16 is driven by the impeller 7 to decelerate, change the flow direction and increase the pressure, and then is discharged along the cavity of the impeller 7 and the air exhaust channel 17 in sequence. In this way, the heat dissipation of the air suspension blower is realized by sucking external air by the impeller 7 without arranging a heat dissipation impeller; thereby reducing the power consumption generated by the heat dissipation impeller and improving the efficiency of the air suspension blower. Meanwhile, the impeller 7 can blow air, so that the working air volume of the impeller is far larger than that of the heat dissipation impeller; therefore, a large amount of air enters the air suspension blower to cool the air suspension blower, the heat dissipation effect is improved, the temperature rise of the motor rotor 10 and the temperature rise of the motor stator 90 are reduced, and the service life of the motor rotor and the motor stator are prolonged. Moreover, when the air suspension blower works, and air flows inside, a labyrinth shape is formed, and an air flow channel is lengthened; the motor outer barrel 1 is matched with the first end cover 3 and the second end cover 4 to form a relatively sealed space, air flow sound and motor electromagnetic sound can be effectively isolated inside the motor barrel, and working noise is reduced.

The motor rotating shaft 5 comprises a first rotating shaft 51, a second rotating shaft 52 and a third rotating shaft 53, the motor rotor 10 is arranged on the first rotating shaft 51, and one end of the second rotating shaft 52 and one end of the third rotating shaft 53 are respectively fixedly connected with two ends of the first rotating shaft 51.

As shown in fig. 2, the air bearing device 6 includes an air-floating radial bearing 61 and an air-floating axial bearing 62; the two air suspension radial bearings 61 are respectively fixed on the first end cover 3 and the second end cover 4, and the two air suspension radial bearings 61 are respectively rotatably connected with the motor rotating shaft 5 so as to radially support and limit the motor rotating shaft 5; the air suspension axial bearing 62 comprises a thrust disc 63 and axial limiting parts 64, the thrust disc 63 is connected with the motor rotating shaft 5, and the two axial limiting parts 64 are respectively located on the two axial sides of the thrust disc 63 so as to axially support and limit the motor rotating shaft 5.

The second rotating shaft 52 includes a first shaft segment 521, a second shaft segment 522, a third shaft segment 523 and a fourth shaft segment 524; the outer walls of the first shaft section 521 and the fourth shaft section 524 are both provided with external threads, and the first rotating shaft 51 is provided with a second boss 54 at one end of the second rotating shaft 52; the second boss 54 is provided with an inner hole with an internal thread, and the external thread of the first shaft section 521 and the internal thread of the inner hole of the second boss 54 are screwed to the position where the end surface of the inner side of the second shaft section 522 is attached to the end surface of the outer side of the second boss 54.

A second shaft sleeve 55 is sleeved on the outer wall of the second boss 54, and a PVD coating is arranged on the outer surface of the second shaft sleeve 55; the second rotating shaft 52 passes through an inner hole of a second shaft sleeve 55, and the outer wall of the second shaft sleeve 55 is rotatably connected with an air suspension radial bearing 61; the second shaft sleeve 55 is provided with a second shaft sleeve boss 551, and the thrust disc 63 is sleeved on the outer wall of the second shaft sleeve boss 551; a thrust disc pressing block 552 is further sleeved on the outer wall of the second shaft sleeve boss 551, and a locking nut 553 is sleeved on the external thread of the fourth shaft section 524; when the lock nut 553 is locked, the second sleeve 55 is axially locked to the second rotating shaft 52, and the thrust plate 63 and the thrust plate presser 552 are axially locked to the second sleeve 55. When the air suspension blower is just started, the second shaft sleeve 55 is not supported and suspended by the air suspension radial bearing 61, and dry friction is generated between the outer wall of the second shaft sleeve 55 and the air suspension radial bearing 61; and because the surface of the second shaft sleeve 55 is smooth and has a PVD coating, the friction coefficient is low, the hardness is high, and the contact friction times can reach more than 40000 times. When the contact friction is damaged at the upper limit, only the worn second shaft bushing 55 needs to be replaced without replacing the second rotating shaft 52, thereby increasing the service life of the second rotating shaft 52.

As shown in fig. 3, the third rotating shaft 53 includes a fifth shaft segment 531, a sixth shaft segment 532, a seventh shaft segment 533 and an eighth shaft segment 534; the outer walls of the fifth shaft section 531 and the eighth shaft section 534 are both provided with external threads, and the first rotating shaft 51 is provided with a third boss 56 at one end of the third rotating shaft 53; the third boss 56 is provided with an inner hole with an internal thread, and the external thread of the five-axis section 531 and the internal thread of the inner hole of the third boss 56 are screwed to the joint position of the end surface of the inner side of the sixth axis section 532 and the end surface of the outer side of the third boss 56.

A third shaft sleeve 57 is sleeved on the outer wall of the third boss 56, and a PVD coating is arranged on the outer surface of the third shaft sleeve 57; the third rotating shaft 53 passes through an inner hole of the third shaft sleeve 57, and the outer wall of the third shaft sleeve 57 is rotatably connected with the air suspension radial bearing 61; the third shaft sleeve 57 is provided with a third shaft sleeve boss 571, the impeller 7 is sleeved on the outer wall of the third shaft sleeve boss 571, and the eighth shaft section 534 is externally threaded with a locking nut 553; when the lock nut 553 is locked, the third shaft housing 57 is axially locked to the third rotating shaft 53, and the impeller 7 is axially locked to the third shaft housing 57. When the air suspension blower is just started, the third shaft sleeve 57 is not supported and suspended by the air suspension radial bearing 61, and dry friction is generated between the outer wall of the third shaft sleeve 57 and the air suspension radial bearing 61; and because the surface of the third shaft sleeve 57 is smooth and has a PVD coating, the friction coefficient is low, the hardness is high, and the contact friction times can reach more than 40000 times. When the contact friction reaches the upper limit and is damaged, only the worn third shaft sleeve 57 needs to be replaced, and the third rotating shaft 53 does not need to be replaced, so that the service life of the third rotating shaft 53 is prolonged.

As shown in fig. 1, a first thrust disc groove 91 is arranged on the inner side of the air inlet end cover 9, and a second thrust disc groove 41 is arranged on the outer side of the second end cover 4; the first thrust disc groove 91 and the second thrust disc groove 41 are oppositely arranged at two ends of the thrust disc 63, and the two axial limiting parts 64 are respectively fixed on the first thrust disc groove 91 and the second thrust disc groove 41.

The impeller 7 is a three-dimensional flow impeller, the air flow of the three-dimensional flow impeller is large during working, more air is fed into the air suspension blower to cool the air suspension blower, and the heat dissipation effect is further improved. The fifth passage 15 is an annular passage and the radially outer surface of the annular passage is circular and the radially inner surface of the annular passage is conical.