阅读说明：本技术 一种压缩机与磁悬浮电机直连的mcl压缩机系统 (MCL compressor system with compressor directly connected with magnetic suspension motor ) 是由 钟仁志 袁军 于 2021-07-28 设计创作，主要内容包括：本发明涉及MCL压缩机领域,尤其涉及一种压缩机与磁悬浮电机直连的MCL压缩机系统。该系统包括磁悬浮电机和MCL压缩机；磁悬浮电机设置有电机轴、电机外壳和径向磁轴承；电机轴设置有径向轴承转子,两个径向磁轴承分别套设在电机轴两端,并且径向磁轴承支撑端与相应位置的径向轴承转子相对齐；MCL压缩机设置有压缩机外壳、压缩机转轴和压缩机磁轴承装置；电机轴与压缩机转轴一端固定连接,压缩机转轴另一端设置有压缩机轴承转子,压缩机磁轴承装置支撑端与压缩机轴承转子相对齐。该系统减少设备的数量和体积,降低整机造价和维护成本。(The invention relates to the field of MCL compressors, in particular to an MCL compressor system with a compressor directly connected with a magnetic suspension motor. The system comprises a magnetic suspension motor and an MCL compressor; the magnetic suspension motor is provided with a motor shaft, a motor shell and a radial magnetic bearing; the motor shaft is provided with a radial bearing rotor, two radial magnetic bearings are respectively sleeved at two ends of the motor shaft, and the supporting ends of the radial magnetic bearings are aligned with the radial bearing rotors at corresponding positions; the MCL compressor is provided with a compressor shell, a compressor rotating shaft and a compressor magnetic bearing device; the motor shaft is fixedly connected with one end of the compressor rotating shaft, the other end of the compressor rotating shaft is provided with a compressor bearing rotor, and the support end of the compressor magnetic bearing device is aligned with the compressor bearing rotor. The system reduces the number and the volume of equipment, and reduces the manufacturing cost and the maintenance cost of the whole machine.)

1. An MCL compressor system with a compressor directly connected with a magnetic suspension motor is characterized by comprising the magnetic suspension motor (1) and an MCL compressor (2); the magnetic suspension motor (1) is provided with a motor shaft (11), a motor shell (12) and a radial magnetic bearing (14); the motor shaft (11) is provided with a radial bearing rotor (17), the two radial magnetic bearings (14) are respectively sleeved at two ends of the motor shaft (11), and the supporting ends of the radial magnetic bearings (14) are aligned with the radial bearing rotor (17) at the corresponding position; the MCL compressor (2) is provided with a compressor shell (31), a compressor rotating shaft (33) and a compressor magnetic bearing device (34); the motor shaft (11) is fixedly connected with one end of the compressor rotating shaft (33), the other end of the compressor rotating shaft (33) is provided with a compressor bearing rotor (331), and the supporting end of the compressor magnetic bearing device (34) is aligned with the compressor bearing rotor (331).

2. An MCL compressor system with compressor directly connected to magnetic suspension motor as claimed in claim 1 characterized in that the motor shaft (11) is fixed to the compressor shaft (33) by screws.

3. An MCL compressor system with compressor directly connected to magnetic levitation motor according to claim 1 characterized in that compressor magnetic bearing means (34) comprises a compressor bearing housing (341) and a compressor radial magnetic bearing (342), the compressor radial magnetic bearing (342) is fixed on the compressor bearing housing (341) and the compressor radial magnetic bearing (342) support end is aligned with the compressor bearing rotor (331).

4. An MCL compressor system with compressor directly connected to magnetic levitation motor according to claim 1 characterized by that the magnetic levitation motor (1) is further provided with a motor stator (13) and an axial magnetic bearing (15), the motor shaft (11) is further provided with a motor rotor (16) and a thrust disc (18); the motor stator (13) is fixedly embedded in the motor shell (12) and is aligned with the motor rotor (16); the axial magnetic bearing (15) is fixed on the motor shell (12), and the limit ends of the axial magnetic bearing (15) are respectively positioned at the two axial ends of the thrust disc (18).

5. An MCL compressor system with compressor directly connected to magnetic levitation motor according to claim 1, characterized in that the MCL compressor (2) is further provided with a plurality of pressure-spreading plates (32); the plurality of pressure expansion plates (32) are fixed in the compressor shell (31), the compressor rotating shaft (33) is fixedly provided with a plurality of impellers (35), and the plurality of impellers (35) are respectively positioned in the plurality of corresponding pressure expansion plates (32).

6. An MCL compressor system with a compressor directly connected with a magnetic levitation motor as claimed in claim 5, wherein the plurality of impellers (35) are divided into two sections of impeller systems, each section of impeller system is provided with the same number of impellers (35), and the two sections of impeller systems are arranged back to back.

7. An MCL compressor system with a directly connected compressor and a magnetic suspension motor according to claim 6, characterized in that a sealing plate (4) is arranged between the two impeller systems, and the sealing plate (4) is used for preventing gas in the impeller system with higher pressure in the two impeller systems from leaking to the impeller system with lower pressure.

8. The MCL compressor system with the compressor directly connected with the magnetic suspension motor is characterized in that the pressure expansion plates (32) comprise pressure expansion plate bodies (321), inlet guide vanes (322) and pressure expansion guide vanes (323), a plurality of pressure expansion plates (32) are arranged in an axial stacking mode, and the inlet guide vane (322) of the former pressure expansion plate (32) is communicated with the pressure expansion guide vane (323) of the latter pressure expansion plate (32); the impellers (35) are respectively positioned in the diffuser vanes (323) at corresponding positions.

9. The MCL compressor system with the compressor directly connected with the magnetic levitation motor as claimed in claim 5, wherein a sealing block (324) is arranged between the inlet guide vane (322) and the diffuser guide vane (323), and the sealing block (324) is used for preventing gas with higher pressure in the diffuser guide vane (323) in the same diffuser plate (32) from leaking to the inlet guide vane (322) with lower pressure.

10. An MCL compressor system with compressor directly connected to magnetic levitation motor according to claim 1 characterized by that the compressor housing (31) is provided with a first inlet (311), a first outlet (312), a second inlet (313) and a second outlet (314); the outside air is communicated with an inlet guide vane (322) of a tail end pressure expanding plate (32) in the first-section impeller system through a first air inlet (311), one end of a first air outlet (312) is communicated with a pressure expanding guide vane (323) of a head end pressure expanding plate (32) in the first-section impeller system, and the other end of the first air outlet (312) is communicated with one end of a second air inlet (313); the other end of the second air inlet (313) is communicated with an inlet guide vane (322) of a tail end pressure expanding plate (32) in the second-section impeller system, and the second air outlet (314) is communicated with a pressure expanding guide vane (323) of a head end pressure expanding plate (32) in the second-section impeller system.

Technical Field

The invention relates to the field of MCL compressors, in particular to an MCL compressor system with a compressor directly connected with a magnetic suspension motor.

Background

A centrifugal compressor is a vane-rotating gas compression machine. Gas is sucked in from the gas inlet chamber, and the impeller works on the gas, so that the pressure, the speed and the temperature of the gas are improved; then the speed is reduced through a diffuser, and kinetic energy is converted into pressure energy to improve the pressure; then flows into a guide bend and a reflux device to lead the gas to enter the next stage of compression; and finally, discharging the high-pressure gas from the final stage along the volute and the gas transmission pipe.

The chinese utility model patent application (publication No. CN202579201U, published: 20121205) discloses a single-shaft multistage centrifugal compressor, which comprises multistage impellers, and each stage adopts a ternary impeller. The shape of the ternary twisted blade is closer to the real state of gas flow in the impeller, the secondary flow loss of the compressor is basically eliminated, the flow loss is small, the efficiency is high, the efficiency is improved by 8-10% compared with the existing similar compressor, and the energy is saved by 2-10%; the ternary impeller has good boosting capacity, so that the diameter of the impeller is smaller than that of a conventional impeller, the equipment has lower rotational inertia, the starting current of a motor is reduced, and the running is safer and more reliable; the performance curve of the ternary impeller centrifugal compressor is flat, the minimum surge flow can reach 50-70% of the flow at the design point, and compared with the conventional impeller centrifugal compressor, the surge flow of the ternary impeller centrifugal compressor moves to a smaller value, so that the reliability of the compressor is improved.

The prior art has the following defects: the two ends of the traditional MCL type compressor are supported by sliding bearings and are connected with a speed increasing box through a mechanical coupler, and the speed increasing box is connected with a three-phase asynchronous motor; in the mode, the compressor is connected with the motor through the speed increasing box, so that the number and the volume of equipment are increased; meanwhile, the compressor can generate mechanical friction when being supported by the sliding bearing and only can provide support for the rotating shaft of the compressor when rotating at low speed, so that the rotating shaft of the compressor has larger volume and high energy consumption; in addition, the sliding bearing needs to be cooled and lubricated by oil, so that the whole machine is high in manufacturing cost and high in maintenance cost.

Disclosure of Invention

The purpose of the invention is: aiming at the problems, the motor shaft of the magnetic suspension motor is directly and fixedly connected with the compressor rotating shaft of the MCL compressor without arranging a speed increasing box, so that the number and the volume of equipment are reduced; meanwhile, the compressor is supported by the magnetic bearing device, so that the rotating speed of a rotating shaft of the compressor is improved, the volume and the energy consumption of the rotating shaft of the compressor are reduced, the rotating shaft of the compressor does not need to be lubricated, and the manufacturing cost and the maintenance cost of the whole machine are reduced.

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

an MCL compressor system with a compressor directly connected with a magnetic suspension motor comprises the magnetic suspension motor and an MCL compressor; the magnetic suspension motor is provided with a motor shaft, a motor shell and a radial magnetic bearing; the motor shaft is provided with a radial bearing rotor, two radial magnetic bearings are respectively sleeved at two ends of the motor shaft, and the supporting ends of the radial magnetic bearings are aligned with the radial bearing rotors at corresponding positions; the MCL compressor is provided with a compressor shell, a compressor rotating shaft and a compressor magnetic bearing device; the motor shaft is fixedly connected with one end of the compressor rotating shaft, the other end of the compressor rotating shaft is provided with a compressor bearing rotor, and the support end of the compressor magnetic bearing device is aligned with the compressor bearing rotor.

Preferably, the motor shaft is fixedly connected with the compressor rotating shaft through a screw.

Preferably, the compressor magnetic bearing means includes a compressor bearing housing and a compressor radial magnetic bearing secured to the compressor bearing housing with the compressor radial magnetic bearing support end aligned with the compressor bearing rotor.

Preferably, the magnetic suspension motor is also provided with a motor stator and an axial magnetic bearing, and the motor shaft is also provided with a motor rotor and a thrust disc; the motor stator is fixedly embedded in the motor shell and is aligned with the motor rotor; the axial magnetic bearing is fixed on the motor shell, and the limiting ends of the axial magnetic bearing are respectively positioned at the two axial ends of the thrust disc.

Preferably, the MCL compressor is further provided with a plurality of pressure expansion plates; a plurality of pressure expansion plates are fixed in a compressor shell, a plurality of impellers are fixedly arranged on a rotating shaft of the compressor, and the impellers are respectively positioned in the corresponding pressure expansion plates.

Preferably, the plurality of impellers is divided into two sections of impeller systems, each section of impeller system is provided with the same number of impellers, and the two sections of impeller systems are arranged back to back.

Preferably, a sealing plate is arranged between the two impeller systems, and the sealing plate is used for preventing gas in the impeller system with higher pressure in the two impeller systems from leaking to the impeller system with lower pressure.

Preferably, the diffuser plate comprises a diffuser plate body, an inlet guide vane and a diffuser guide vane, the plurality of diffuser plates are axially stacked, and the inlet guide vane of the former diffuser plate is communicated with the diffuser guide vane of the latter diffuser plate; the impellers are respectively positioned in the diffuser vanes at corresponding positions.

Preferably, a sealing block is arranged between the inlet guide vane and the diffuser guide vane, and the sealing block is used for preventing gas with higher pressure in the diffuser guide vane in the same diffuser plate from leaking into the inlet guide vane with lower pressure.

Preferably, the compressor housing is provided with a first air inlet, a first air outlet, a second air inlet and a second air outlet; the outside air is communicated with an inlet guide vane of a tail end diffusion plate in the first section of impeller system through a first air inlet, one end of a first air outlet is communicated with a diffusion guide vane of a head end diffusion plate in the first section of impeller system, and the other end of the first air outlet is communicated with one end of a second air inlet; the other end of the second air inlet is communicated with an inlet guide vane of a tail end pressure expanding plate in the second section impeller system, and the second air outlet is communicated with a pressure expanding guide vane of a head end pressure expanding plate in the second section impeller system.

The MCL compressor system with the compressor directly connected with the magnetic suspension motor, which adopts the technical scheme, has the advantages that:

the motor shaft is directly and fixedly connected with the rotating shaft of the compressor, is supported by two radial magnetic bearings and a magnetic bearing device of the compressor and is controlled by a set of magnetic bearing controller; namely, the magnetic suspension motor can directly drive the rotating shaft of the compressor to rotate without arranging a speed increasing box, so that the number and the volume of equipment are reduced; meanwhile, the MCL compressor is supported by the compressor magnetic bearing device, so that the rotating speed of a rotating shaft of the compressor is improved, and the volume and the energy consumption of the rotating shaft of the compressor are reduced; and the magnetic bearing device of the compressor is not required to be lubricated, so that the manufacturing cost and the maintenance cost of the whole machine are reduced.

Drawings

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

Fig. 2 is a schematic structural view of a compressor rotating shaft.

Fig. 3 is a schematic structural view of the pressure-expanding plate.

Fig. 4 is a schematic structural view of a compressor housing.

332-balance disk.

Detailed Description

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

Example 1

An MCL compressor system with a compressor directly connected with a magnetic suspension motor is shown in fig. 1, and comprises a magnetic suspension motor 1 and an MCL compressor 2; the magnetic suspension motor 1 is provided with a motor shaft 11, a motor shell 12 and a radial magnetic bearing 14; the motor shaft 11 is provided with a radial bearing rotor 17, the two radial magnetic bearings 14 are respectively sleeved at two ends of the motor shaft 11, and the supporting ends of the radial magnetic bearings 14 are aligned with the radial bearing rotor 17 at the corresponding position; the MCL compressor 2 is provided with a compressor housing 31, a compressor shaft 33 and a compressor magnetic bearing device 34; the motor shaft 11 is fixedly connected with one end of the compressor rotating shaft 33, the other end of the compressor rotating shaft 33 is provided with a compressor bearing rotor 331, and the supporting end of the compressor magnetic bearing device 34 is aligned with the compressor bearing rotor 331. In this manner, the motor shaft 11 is directly and fixedly connected to the compressor shaft 33, supported by two radial magnetic bearings 14 and a compressor magnetic bearing device 34, and controlled by a set of magnetic bearing controllers; namely, the magnetic suspension motor 1 can directly drive the compressor rotating shaft 33 to rotate without arranging a speed increasing box, so that the number and the volume of equipment are reduced; meanwhile, the MCL compressor 3 is supported by the compressor magnetic bearing device 34, so that the rotating speed of the compressor rotating shaft 33 is improved, and the volume and the energy consumption of the compressor rotating shaft 33 are reduced; and the magnetic bearing device 34 of the compressor does not need to be lubricated, so that the manufacturing cost and the maintenance cost of the whole machine are reduced.

The motor shaft 11 is fixedly connected with the compressor rotating shaft 33 through screws.

The compressor magnetic bearing device 34 includes a compressor bearing housing 341 and a compressor radial magnetic bearing 342, the compressor radial magnetic bearing 342 is fixed on the compressor bearing housing 341, and a support end of the compressor radial magnetic bearing 342 is aligned with the compressor bearing rotor 331. Compressor radial magnetic bearings 342 of compressor shaft 33 each drive compressor bearing rotor 331 to provide radial support to compressor shaft 33.

The magnetic suspension motor 1 is also provided with a motor stator 13 and an axial magnetic bearing 15, and the motor shaft 11 is also provided with a motor rotor 16 and a thrust disc 18; the motor stator 13 is fixedly embedded in the motor shell 12 and is aligned with the motor rotor 16; the axial magnetic bearing 15 is fixed on the motor housing 12, and the limit ends of the axial magnetic bearing 15 are respectively located at two axial ends of the thrust disc 18. After the motor stator 13 drives the motor rotor 16 to rotate, the radial magnetic bearing 14 drives the radial bearing rotor 17 to radially support the motor shaft 11, and the axial magnetic bearing 15 drives the thrust disc 18 to axially limit the motor shaft 11, so that the radial and axial support and limit of the motor shaft 11 are realized.

The MCL compressor 2 is also provided with a plurality of pressure expansion plates 32; the plurality of diffuser plates 32 are fixed in the compressor housing 31, the compressor rotating shaft 33 is fixedly provided with a plurality of impellers 35, and the plurality of impellers 35 are respectively positioned in the plurality of corresponding diffuser plates 32.

As shown in fig. 2, the plurality of impellers 35 are divided into two stages of impeller systems, each stage of impeller system is provided with the same number of impellers 35, and the two stages of impeller systems are arranged back to back so as to cancel a large axial force.

And a sealing plate 4 is arranged between the two sections of impeller systems, and the sealing plate 4 is used for preventing gas in the section of impeller system with higher pressure in the two sections of impeller systems from leaking to the section of impeller system with lower pressure.

As shown in fig. 3, the diffuser plate 32 includes a diffuser plate body 321, inlet guide vanes 322, and diffuser guide vanes 323, a plurality of diffuser plates 32 are axially stacked, and the inlet guide vanes 322 of the former diffuser plate 32 communicate with the diffuser guide vanes 323 of the latter diffuser plate 32; the plurality of impellers 35 are respectively located in the diffuser vanes 323 at corresponding positions. The inlet guide vanes 322 and the diffuser guide vanes 323 function to rectify flow and improve flow field efficiency.

A sealing block 324 is disposed between the inlet guide vane 322 and the diffuser guide vane 323, and the sealing block 324 is used to prevent the gas with higher pressure in the diffuser guide vane 323 in the same diffuser plate 32 from leaking into the inlet guide vane 322 with lower pressure.

As shown in fig. 4, the compressor housing 31 is provided with a first inlet 311, a first outlet 312, a second inlet 313, and a second outlet 314; the outside air is communicated with an inlet guide vane 322 of the tail end pressure expanding plate 32 in the first-stage impeller system through a first air inlet 311, one end of a first air outlet 312 is communicated with a pressure expanding guide vane 323 of the head end pressure expanding plate 32 in the first-stage impeller system, and the other end of the first air outlet 312 is communicated with one end of a second air inlet 313; the other end of the second air inlet 313 is communicated with an inlet guide vane 322 of the tail end diffuser plate 32 in the second-stage impeller system, and the second air outlet 314 is communicated with a diffuser guide vane 323 of the head end diffuser plate 32 in the second-stage impeller system. After the magnetic suspension motor 1 drives the MCL compressor 3 to rotate, the compressor rotating shaft 33 rotates at a high speed; the gas enters the inlet guide vanes 322 of the end diffuser plate 32 in the first-stage impeller system from the first gas inlet 311, and then the impeller 35 in the first-stage impeller system performs the first-stage multi-stage compression on the gas and discharges the compressed gas from the first gas outlet 312; the gas from the first gas outlet 312 then enters the second gas inlet 313 and passes through the inlet guide vanes 322 of the end diffuser plate 32 in the second stage of the impeller system, which is subjected to a second stage of multi-stage compression by the impeller 35 in the second stage of the impeller system and exits the compressor via the second gas outlet 314.