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CN-120667395-B - Magnetic suspension high-speed centrifugal compressor

CN120667395BCN 120667395 BCN120667395 BCN 120667395BCN-120667395-B

Abstract

The invention relates to a magnetic suspension high-speed centrifugal compressor applied to the field of compressors, which can radiate heat from outside to inside through the arrangement of a water channel radiating channel and an outer air channel radiating channel, so that the temperature near a central rotor is reduced to a certain extent, the probability of deformation of the central rotor due to overheat expansion is effectively reduced, meanwhile, an inner air channel radiating channel is arranged at an air gap between the central rotor and a stator, and a large amount of heat near the air gap can be absorbed, and then the low-temperature gas directly passes through the inner air passage to dissipate heat and remove the heat, compared with the prior art, the method can realize targeted cooling of the air gap under the condition that the low-temperature gas is not in direct contact with the central rotor, effectively reduce the occurrence of shaft runout of the central rotor caused by high-temperature expansion deformation, and simultaneously, the method is not easy to cause additional increase of the control difficulty of the bearing controller for maintaining balance of the central rotor due to disturbance of the low-temperature gas, so that the efficient operation of the compressor is effectively ensured.

Inventors

  • ZHANG CHAO
  • HU LIANGBING
  • YANG ZHI
  • REN HAOYUAN

Assignees

  • 超昇速科技(无锡)有限公司

Dates

Publication Date
20260508
Application Date
20250513

Claims (8)

  1. 1. A magnetic suspension high-speed centrifugal compressor is characterized by comprising a magnetic suspension driving unit, a first-stage compression volute (1) and a double-channel shell (2), wherein the first-stage compression volute (1) and the double-channel shell (2) are fixedly arranged at the left end and the right end of the magnetic suspension driving unit, a communicating pipe (4) is fixedly connected between an air outlet of the first-stage compression volute (1) and an air inlet of a second-stage compression volute (3), an outer heat radiating unit is fixedly wrapped at the outer end of the magnetic suspension driving unit, bearing seats (702) are fixedly connected at the left end and the right end of the outer heat radiating unit through bolts, bases (201) are fixedly connected at the lower ends of the two bearing seats (702), the magnetic suspension driving unit comprises a central rotor (71), magnetic suspension bearings (701) arranged at the two ends of the central rotor (71) and a stator (72) movably sleeved in the middle of the outer end of the central rotor (71), the stator (72), the central rotor (71) and the two magnetic suspension bearings (701) are coaxially arranged, are not contacted with each other, the two bearing seats (702) are coaxially fixed with the two bearing seats (702), the outer ends of the outer bearing seats (701) are close to one side of the second-stage compression volute (3), the outer end of the second-stage compression volute is provided with a temperature sensor, an air gap (71) is arranged in the central air passage (8), the inner air passage (71) is formed in the magnetic suspension passage (8), and the air passage is formed in the air passage (8), the inner air passage heat dissipation tube (8) is coaxial with the stator (72) and fixedly connected with the inner wall of the stator (72) without contacting with the central rotor (71); The outer heat dissipation unit comprises a double-channel shell (2) sleeved outside a stator (72), a gas-equalizing cover (5) fixedly connected to the outer end of one side of the double-channel shell (2) close to a first-stage compression volute (1) and a gas-distributing ring (6) fixedly connected to the outer end of one side of the double-channel shell (2) close to a second-stage compression volute (3), two gas-distributing rings (203) are fixedly connected to the outer end of the stator (72), the double-channel shell (2) comprises an inner cover shell (22), an outer cover shell (21) fixedly wrapped at the middle part of the outer end of the inner cover shell (22) and a gas-distributing strip (23) fixedly connected to the outer end of the inner cover shell (22), the gas-distributing strip (23) is positioned on the inner side of the outer cover shell (21), the outer rings of the two gas-distributing rings (203) are mutually contacted with the inner wall of the inner cover shell (22), two horizontal water-distributing holes (202) are fixedly connected to the middle part of the outer end of the outer cover shell (21), the two water-distributing holes (202) are communicated with the outer cover shell (21) and the space of the inner cover shell (22), and the gas-distributing ring (22) form a gas-distributing channel (6), and the gas-distributing channel (2) is formed between the gas-distributing channel and the gas-distributing channel (2).
  2. 2. A magnetic suspension high-speed centrifugal compressor according to claim 1, wherein the flow dividing strip (23) is of a spiral structure, and the outer end of the flow dividing strip (23) is in contact with the inner wall of the outer shell (21).
  3. 3. The magnetic levitation high-speed centrifugal compressor of claim 1, wherein a plurality of air inlets (501) and a plurality of air outlets (502) are respectively formed in the left and right outer ends of the inner cover shell (22), the air inlets (501) are located on the inner side of the air homogenizing cover (5), the air outlets (502) are located on the inner side of the split-flow ventilation ring (6), and a plurality of air holes distributed in an annular array are formed in the air isolating ring (203).
  4. 4. A magnetic suspension high-speed centrifugal compressor according to claim 3, characterized in that the gas equalizing cover (5) comprises a gas inlet half cover (51) and a gas guide half cover (52) which are fixedly connected with each other through bolts, and when the gas inlet half cover and the gas guide half cover are mutually fixed, the inner side of the gas equalizing cover forms a complete circle, and the circle is matched with the outer wall of the inner cover shell (22).
  5. 5. The magnetic suspension high-speed centrifugal compressor of claim 4, wherein one of the exhaust inner holes (502) is an arc long hole, the other exhaust inner holes (502) are rectangular long holes, the split ventilation ring (6) comprises a split seat (61) corresponding to the arc long hole and a split ring body (62) fixedly connected with the split seat (61), the split seat (61) and the split ring body (62) are provided with fine holes, and the fine holes on the air equalizing cover (5), the air inlet holes (501), the exhaust inner holes (502) and the split ventilation ring (6) are sequentially communicated.
  6. 6. The magnetic suspension high-speed centrifugal compressor of claim 1, wherein the inner air passage heat dissipation channel (8) comprises a double-layer cylinder body (81) and side rings (82) fixedly connected to the left end and the right end of the double-layer cylinder body (81), air guide pipes (83) are fixedly connected to the outer ends of the two side rings (82), the two air guide pipes (83) are symmetrical about the vertical center line of the double-layer cylinder body (81) in a side view angle, the double-layer cylinder body (81) is of a hollow structure, a separation strip (801) is fixedly connected to the inside of the double-layer cylinder body (81), and the separation strip (801) is positioned between the two air guide pipes (83).
  7. 7. The magnetic suspension high-speed centrifugal compressor of claim 6, wherein a plurality of evenly distributed temperature sensing strips (9) are fixedly connected between two side rings (82), the temperature sensing strips (9) are positioned in a hollow double-layer cylinder (81), the temperature sensing strips (9) comprise heat absorbing wires (91) positioned in the double-layer cylinder (81), follow-up wires (92) and temperature sensing wires (93) which are respectively and fixedly connected to the left end and the right end of the heat absorbing wires (91), and two limit balls (94) which are respectively and fixedly connected with the ends of the follow-up wires (92) and the temperature sensing wires (93), the two limit balls (94) are respectively and fixedly connected with the two side rings (82), and the follow-up wires (92) and the temperature sensing wires (93) movably penetrate through the corresponding side rings (82).
  8. 8. The magnetic levitation high-speed centrifugal compressor as set forth in claim 7, wherein the temperature sensing wire (93) is made of a double-pass memory alloy material, the follow-up wire (92) is made of a high-temperature-resistant elastic material, and the double-layer cylinder (81), the side ring (82) and the heat absorbing wire (91) are made of materials with high heat conductivity and low magnetic conductivity.

Description

Magnetic suspension high-speed centrifugal compressor Technical Field The invention relates to a magnetic suspension high-speed centrifugal compressor, in particular to a magnetic suspension high-speed centrifugal compressor applied to the field of compressors. Background A magnetic suspension bearing is a bearing that uses a magnetic field to suspend a rotor so that mechanical friction is not generated during rotation. The magnetic suspension bearing is used in the refrigeration compressor, so that the refrigeration system can run without oil, and a complex lubricating oil system is avoided. Although the design of magnetic suspension reduces and generates heat because of mechanical abrasion, when the compressor is operated, the internal temperature of the compressor is higher when the compressor is used due to the reasons of gas temperature rise, electromagnetic loss and the like during compression, the thermal expansion of a central rotating shaft can be caused when the compressor is severe, the diameter of a rotor is increased, an air gap is reduced, the difficulty of magnetic force control is increased, and the rotating shaft is unbalanced and collides with a bearing when the compressor is severe. Based on the above problems, in some prior art, the rotating shaft is hollow and is cooled by introducing low-temperature gas, for example, a motor cooling circuit disclosed in the chinese patent specification with publication No. CN114629299a through the hollow shaft, or a magnetic suspension fan for self-priming cooling of an impeller disclosed in the chinese patent specification with publication No. CN113217426B, wherein cooling gas is sprayed to the central shaft in an air gap to accelerate heat dissipation, so that the central shaft maintains relatively low temperature and maintains stability. However, no matter the low-temperature fluid is introduced into the central shaft or is discharged from the outer part of the central shaft, the self-contained speed of the gas can generate certain impact on the rotor, and certain jumping phenomenon of the rotor shaft can be caused, so that the difficulty in controlling the balance and floating of the rotor by the bearing controller is increased. Disclosure of Invention Aiming at the prior art, the invention aims to solve the technical problem that the central rotor is easy to thermally expand and deform due to overheating, so that the shaft is jumped. In order to solve the problems, the invention provides a magnetic suspension high-speed centrifugal compressor, which comprises a magnetic suspension driving unit, a first-stage compression volute and a double-channel shell, wherein the first-stage compression volute and the double-channel shell are fixedly arranged at the left end and the right end of the magnetic suspension driving unit, a communicating pipe is fixedly connected between an air outlet of the first-stage compression volute and an air inlet of the second-stage compression volute, an outer heat radiating unit is fixedly wrapped at the outer end of the magnetic suspension driving unit, bearing seats are fixedly connected at the left end and the right end of the outer heat radiating unit through bolts, bases are fixedly connected at the lower ends of the two bearing seats, the magnetic suspension driving unit comprises a central rotor, magnetic suspension bearings arranged at two ends of the central rotor and a stator movably sleeved in the middle of the outer end of the central rotor, wherein the stator, the central rotor and the two magnetic suspension bearings are coaxially arranged and are not contacted with each other, the two magnetic suspension bearings are respectively coaxially fixed with the two bearing seats, a temperature sensor is arranged at the outer end of the magnetic suspension bearing, which is close to one side of the secondary compression volute, the space between the central rotor and the stator forms an air gap, an inner air passage heat dissipation channel is arranged in the air gap, the inner air passage heat dissipation channel is movably sleeved outside the central rotor and is not contacted with the central rotor, and the inner air passage heat dissipation channel is coaxial with the stator and is fixedly connected with the inner wall of the stator; The outer heat dissipation unit comprises a double-channel shell sleeved outside the stator, a gas equalizing cover fixedly connected to the outer end of the double-channel shell, which is close to one side of the first-stage compression volute, and a gas distributing and penetrating ring fixedly connected to the outer end of the double-channel shell, which is close to one side of the second-stage compression volute, wherein the outer end of the stator is fixedly connected with two air isolating rings, the double-channel shell comprises an inner shell, an outer shell fixedly wrapped in the middle of the outer end of the inner shell, and a gas distributing strip fixedly connected to