CN216077734U

CN216077734U - Heat dissipation system of magnetic suspension multistage compressor

Info

Publication number: CN216077734U
Application number: CN202122174807.5U
Authority: CN
Inventors: 袁军; 钟仁志
Original assignee: Xinlei Compressor Co Ltd
Current assignee: Xinlei Compressor Co Ltd
Priority date: 2021-09-09
Filing date: 2021-09-09
Publication date: 2022-03-18
Anticipated expiration: 2031-09-09

Abstract

The utility model relates to the field of multistage compressors, in particular to a heat dissipation system of a magnetic suspension multistage compressor. The compressor comprises a motor cylinder, a front bearing seat, a rear bearing seat and a motor shaft system; a motor stator is fixedly embedded in an inner hole of the motor cylinder, a driving main shaft is arranged on a motor shaft system, and a motor rotor is sleeved on the outer wall of the driving main shaft; the rear bearing seat is provided with a plurality of second channels which axially penetrate through; the driving main shaft is provided with an axial third channel and a radial through fourth channel, and the motor cylinder is provided with a radial through fifth channel and a radial through sixth channel; the second channel, a gap between the motor rotor and the motor stator and the fifth channel are communicated with each other to form a first heat dissipation channel; the second channel, a gap between the motor rotor and the motor stator and the sixth channel are communicated with each other to form a second heat dissipation channel; the third channel, the fourth channel and the sixth channel are communicated with each other to form a third heat dissipation channel. This compressor guides inside heat, and then improves compressor radiating efficiency.

Description

Heat dissipation system of magnetic suspension multistage compressor

Technical Field

The utility model relates to the field of multistage compressors, in particular to a heat dissipation system of a magnetic suspension multistage compressor.

Background

The multistage compressor refers to a compressor which increases the gas pressure step by step. Industrial gases sometimes require higher pressures and require multi-stage compression to increase the pressure of the gas in stages. As the required pressure increases, the number of stages of the compressor increases. The multistage compressor is widely applied to the aspects of petrochemical industry, synthetic ammonia, urea, air separation, refrigeration engineering and the like.

The Chinese invention patent application (publication No. CN104421188A, published: 20150318) discloses a multistage centrifugal compressor and an air conditioning unit, wherein the multistage centrifugal compressor comprises a power part and an impeller part, the power part comprises a motor, and a shaft of the motor comprises a first end of the shaft and a second end of the shaft; the impeller part comprises N impellers, and N is more than or equal to 2 and less than 10; when N is a double number, the number of the impellers on the first end of the shaft is equal to that of the impellers on the second end of the shaft; when N is singular, the number of impellers on the first end of the shaft is one more than that on the second end of the shaft; the first-stage impeller is arranged on the first end of the shaft and is farthest away from the motor; the other impellers on the first end of the shaft are sequentially arranged in an ascending order; the Nth-stage impeller is arranged at the second end of the shaft and is closest to the motor; the other impellers on the second end of the shaft are sequentially arranged in a descending order; the air outlet of the first end impeller of the shaft is communicated with the air inlet of the second end impeller of the shaft through a connecting pipeline, so that the purposes of improving the pressure ratio and the energy efficiency are achieved.

The prior art has the following defects: when the traditional multistage compressor is cooled, heat dissipation holes are formed in a motor cylinder, and heat generated by parts in the compressor is conducted to the heat dissipation holes through gaps among the parts so as to be discharged; in the mode, heat is spontaneously conducted to the heat dissipation holes along the gaps among the parts, no heat dissipation channel is used for guiding the heat inside the compressor, and the heat dissipation efficiency of the compressor is reduced.

Disclosure of Invention

The purpose of the utility model is: aiming at the problems, the heat dissipation system of the magnetic suspension multistage compressor is provided, wherein the first heat dissipation channel, the second heat dissipation channel and the third heat dissipation channel are respectively arranged inside the compressor to guide the heat inside the compressor, and further the heat dissipation efficiency of the compressor is improved.

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

a heat dissipation system of a magnetic suspension multistage compressor comprises a motor barrel, a front bearing seat, a rear bearing seat and a motor shaft system; the front bearing seat and the rear bearing seat are respectively fixed at two ends of the motor cylinder; a motor stator is fixedly embedded in an inner hole of the motor barrel, a driving main shaft is arranged on the motor shaft system, and a motor rotor corresponding to the motor stator is fixedly sleeved on the outer wall of the driving main shaft; the rear bearing seat is provided with a plurality of second channels which axially penetrate through; the driving main shaft is provided with an axial third channel and a radial through fourth channel, and the motor cylinder is provided with a radial through fifth channel and a radial through sixth channel; the second channel, a gap between the motor rotor and the motor stator and the fifth channel are communicated with each other to form a first heat dissipation channel; the second channel, a gap between the motor rotor and the motor stator and the sixth channel are communicated with each other to form a second heat dissipation channel; the third channel, the fourth channel and the sixth channel are communicated with each other to form a third heat dissipation channel.

Preferably, the motor cylinder is further provided with an air guide part, and an upper air guide surface and a lower air guide surface are respectively arranged on the radial outer side surface and the radial inner side surface of the air guide part; the upper air guide surface is located at the air inlet end of the fifth channel, the lower air guide surface is located at the air inlet end of the sixth channel, and the upper air guide surface and the lower air guide surface are both curved surfaces.

Preferably, the plurality of second passages are distributed along the circumferential direction.

Preferably, a heat dissipation base is fixedly arranged on the outer side of the rear bearing seat, a heat dissipation fan is fixedly arranged on the end face of the inner side of the heat dissipation base, and the heat dissipation fan is used for dissipating heat inside the motor cylinder.

Preferably, the heat dissipation base is provided with a first channel which axially penetrates through and is communicated with the outside, and the first channel is respectively communicated with the second channel and the third channel.

Preferably, the front bearing seat is provided with a heat dissipation rib on the inner side end face, and the heat dissipation rib is used for dissipating heat inside the motor cylinder.

The heat dissipation system of the magnetic suspension multistage compressor adopting the technical scheme has the advantages that:

when the compressor works, external cooling air respectively guides heat inside the compressor through the first heat dissipation channel, the second heat dissipation channel and the third heat dissipation channel, and then the heat generated by internal parts of the compressor, such as a motor shaft system and a motor stator, is taken out of the compressor along the plurality of heat dissipation channels; thereby improving the heat dissipation efficiency of the compressor and avoiding the damage of the internal parts of the compressor due to overheating.

Drawings

Fig. 1 is a schematic structural view of a magnetic levitation multistage compressor.

Fig. 2 is a schematic structural diagram of the first heat dissipation channel, the second heat dissipation channel, and the third heat dissipation channel.

Fig. 3 and 4 are schematic structural views of the front bearing seat.

Fig. 5 is a schematic structural view of a multi-stage compressor rotor system.

Fig. 6 and 7 are schematic structural diagrams of a section A-A and a section B-B of the rotor system respectively.

Fig. 8 is a schematic structural view of the impeller.

Fig. 9 is a schematic structural view of the motor cartridge.

Fig. 10 and 11 are schematic structural views of the rear bearing.

Fig. 12 and 13 are schematic structural diagrams of a volute.

Detailed Description

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

Example 1

A heat dissipation system of a magnetic suspension multistage compressor comprises a motor barrel 12, a front bearing seat 13, a rear bearing seat 14 and a motor shaft system 20; a front bearing block 13 and a rear bearing block 14 are respectively fixed at two ends of the motor barrel 12; a motor stator 11 is fixedly embedded in an inner hole of the motor barrel 12, a driving main shaft 21 is arranged on the motor shaft system 20, and a motor rotor 23 corresponding to the motor stator 11 in position is fixedly sleeved on the outer wall of the driving main shaft 21; the rear bearing block 14 is provided with a plurality of second passages 62 which axially penetrate; the driving main shaft 21 is provided with an axial third channel 63 and a radial through fourth channel 64, and the motor barrel 12 is provided with a radial through fifth channel 65 and a radial through sixth channel 66; the second channel 62, the gap between the motor rotor 23 and the motor stator 11 and the fifth channel 65 are communicated with each other to form a first heat dissipation channel; the second channel 62, the gap between the motor rotor 23 and the motor stator 11 and the sixth channel 66 are communicated with each other to form a second heat dissipation channel; the third passage 63, the fourth passage 64, and the sixth passage 66 communicate with each other to form a third heat dissipation passage. When the compressor works, external cooling air respectively guides heat inside the compressor through the first heat dissipation channel, the second heat dissipation channel and the third heat dissipation channel, and then the heat generated by internal parts of the compressor, such as the motor shaft system 20 and the motor stator 11, is taken out of the compressor along the plurality of heat dissipation channels; thereby improving the heat dissipation efficiency of the compressor and avoiding the damage of the internal parts of the compressor due to overheating.

The motor barrel 12 is further provided with an air guide part 15, and an upper air guide surface 151 and a lower air guide surface 152 are respectively arranged on the radial outer side surface and the radial inner side surface of the air guide part 15; the upper wind guiding surface 151 is located at the wind inlet end of the fifth channel 65, the lower wind guiding surface 152 is located at the wind inlet end of the sixth channel 66, and both the upper wind guiding surface 151 and the lower wind guiding surface 152 are curved surfaces.

The plurality of second passages 62 are distributed along the circumferential direction. The outer side of the rear bearing seat 14 is fixedly provided with a heat dissipation base 5, the inner side end face of the heat dissipation base 5 is fixedly provided with a heat dissipation fan 51, and the heat dissipation fan 51 is used for dissipating heat inside the motor barrel 12.

The heat radiation base 5 is provided with a first passage 61 which axially penetrates and communicates with the outside, and the first passage 61 communicates with a second passage 62 and a third passage 63, respectively.

The outer wall of the driving main shaft 21 is also sleeved with a main shaft bearing 22, and the driving main shaft 21 is provided with a driving magnetic steel 24; the plurality of driving magnetic steels 24 are fixedly arranged on the driving spindle 21 along the circumferential direction, and the N poles and the S poles of the adjacent driving magnetic steels 24 are arranged in opposite directions in the radial direction; the motor shaft system 20 is further provided with a plurality of driven shaft systems 3, each driven shaft system 3 comprises a driven main shaft 31, a driven bearing 32, driven magnetic steel 33 and an impeller 34, and the driven main shafts 31 of the driven shaft systems 3 are distributed on the outer side of the driving main shaft 21 along the circumferential direction; a plurality of driven magnetic steels 33 are fixedly arranged on the driven main shaft 31 along the circumferential direction, and the N pole and the S pole of the adjacent driven magnetic steels 33 are arranged in the opposite directions in the radial direction; the positions of the driven magnetic steels 33 correspond to the positions of the driving magnetic steels 24, and the ratio of the number of the driving magnetic steels 24 to the number of the driven magnetic steels 33 of different driven shafts 3 is the same as the speed increasing ratio of the driving main shaft 21 to the corresponding driven shaft 3; the volute 4 is arranged outside the front bearing seat 13, the impeller 34 is fixed at one end of the driven main shaft 31, and the impellers 34 of the plurality of driven shaft systems 3 are respectively positioned in the corresponding compression passages of the volute 4. When the electric vehicle works, the motor stator 11 is electrified to drive the motor rotor 23 to rotate so as to drive the driving main shaft 21 to rotate; the driving magnetic steel 24 rotates along with the driving main shaft 21 and drives the driven main shafts 31 of the driven shaft systems 3 to rotate simultaneously through the driven magnetic steel 33 driving the driven shaft systems 3; the impellers 34 of the driven shafting 3 rotate simultaneously to perform multi-stage compression on the fluid to be compressed, and the working process is completed. In this way, compared with the gear box speed increasing: the driving magnetic steel 24 on the driving main shaft 21 drives the driven main shafts 31 of the plurality of driven shaft systems 3 simultaneously through magnetic force, namely, the plurality of driven shaft systems 3 can be driven without arranging a gear box, and the size of the whole equipment is reduced; and when the magnetic drive is adopted, oil is not needed to lubricate the magnetic drive, so that the process of maintaining equipment is reduced. Compared with direct drive of a high-speed motor: only one impeller 34 needs to be fixed on each driven main shaft 31, namely, the driven main shaft 31 only needs a short length to drive the impeller 34 to rotate; the driven main shaft 31 with a short length is stable in structure and is not easy to resonate when rotating at a high speed, so that the critical rotating speed of the driven main shaft 31 is improved; moreover, when each driven main shaft 31 only drives one impeller 34 with light total weight, the load is small, and resonance is not easy to generate when the driven main shaft 31 rotates at high speed; therefore, the critical rotating speed of the driven main shaft 31 is further improved, the volume of the compression part of the impeller is further reduced, and the compression ratio of the whole equipment is improved.

The front bearing block 13 is provided with a plurality of driven bearing holes 131, and the rear bearing block 14 is provided with a driving bearing hole 141; the main shaft bearing 22 is positioned in the main shaft bearing hole 141 and is sleeved at one end of the driving main shaft 21, and the driven bearing 32 comprises a first driven bearing 321 and a second driven bearing 322; the first driven bearing 321 is located in the driven bearing hole 131 and is sleeved at one end of the driven main shaft 31, the inner ring of the second driven bearing 322 is sleeved at the other end of the driven main shaft 31, and the outer ring of the second driven bearing 322 is attached to the outer wall of the other end of the driving main shaft 21. The main shaft bearing 22 and the first driven bearing 321 respectively support the outside of the driving main shaft 21 and the outside of the driven main shaft 31 in a hard manner, and the second driven bearing 322 supports the inside of the driving main shaft 21 and the inside of the driven main shaft 31 in a soft manner so as to support the driving main shaft 21 and the driven main shaft 31 at the same time.

A wave spring 221 is arranged between the main shaft bearing 22 and the rear bearing seat 14, and two ends of the wave spring 221 are respectively attached to the end surface of the outer side of the main shaft bearing 22 and the corresponding end surface of the inner side of the rear bearing seat 14; the wave spring 221 is used to pre-tension the main shaft bearing 22 to prevent axial play.

The front bearing seat 13 is provided with a heat dissipation rib 132 on an inner end surface, and the heat dissipation rib 132 is used for dissipating heat inside the motor barrel 12.

The outer wall of driven magnet steel 33 of driven spindle 31 is fixedly sleeved with carbon fiber sheath 331, and carbon fiber sheath 331 is used for preventing driven magnet steel 33 from being damaged.

Claims

1. A heat dissipation system of a magnetic suspension multistage compressor is characterized in that the compressor comprises a motor barrel (12), a front bearing seat (13), a rear bearing seat (14) and a motor shaft system (20); a front bearing seat (13) and a rear bearing seat (14) are respectively fixed at two ends of the motor barrel (12); a motor stator (11) is fixedly embedded in an inner hole of the motor barrel (12), a driving main shaft (21) is arranged on the motor shaft system (20), and a motor rotor (23) corresponding to the motor stator (11) in position is fixedly sleeved on the outer wall of the driving main shaft (21); the rear bearing seat (14) is provided with a plurality of second channels (62) which axially penetrate through; the driving main shaft (21) is provided with an axial third channel (63) and a radial through fourth channel (64), and the motor barrel (12) is provided with a radial through fifth channel (65) and a radial through sixth channel (66); the second channel (62), the gap between the motor rotor (23) and the motor stator (11) and the fifth channel (65) are communicated with each other to form a first heat dissipation channel; the second channel (62), a gap between the motor rotor (23) and the motor stator (11) and the sixth channel (66) are communicated with each other to form a second heat dissipation channel; the third channel (63), the fourth channel (64) and the sixth channel (66) are communicated with each other to form a third heat dissipation channel.

2. The heat dissipation system of the magnetic suspension multistage compressor, as recited in claim 1, wherein the motor barrel (12) is further provided with a wind guiding portion (15), the wind guiding portion (15) is provided with an upper wind guiding surface (151) and a lower wind guiding surface (152) on the radial outer side surface and the radial inner side surface, respectively; the upper air guide surface (151) is positioned at the air inlet end of the fifth channel (65), the lower air guide surface (152) is positioned at the air inlet end of the sixth channel (66), and the upper air guide surface (151) and the lower air guide surface (152) are both curved surfaces.

3. The heat dissipation system of a magnetic levitation multistage compressor as recited in claim 1, wherein the plurality of second channels (62) are distributed along a circumferential direction.

4. The heat dissipation system of the magnetic suspension multistage compressor is characterized in that a heat dissipation base (5) is fixedly arranged on the outer side of the rear bearing seat (14), a heat dissipation fan (51) is fixedly arranged on the end face of the inner side of the heat dissipation base (5), and the heat dissipation fan (51) is used for dissipating heat inside the motor cylinder (12).

5. The heat dissipation system of a magnetic levitation multistage compressor as recited in claim 4, wherein the heat dissipation base (5) is provided with a first channel (61) axially penetrating and communicating with the outside, and the first channel (61) communicates with the second channel (62) and the third channel (63), respectively.

6. The heat dissipation system of the magnetic levitation multistage compressor as recited in claim 1, wherein the front bearing seat (13) is provided with heat dissipation ribs (132) at an inner end face, and the heat dissipation ribs (132) are used for dissipating heat inside the motor cylinder (12).