Magnetic suspension compressor and magnetic suspension air conditioner

Abstract

The invention relates to the technical field of refrigeration equipment, and discloses a magnetic suspension compressor which comprises a machine shell, a magnetic suspension assembly and a magnetic suspension assembly. The impeller is of a shaft structure and is arranged in the accommodating cavity; the impeller is provided with a first-stage flow channel and a second-stage flow channel, the machine shell is provided with a first-stage diffuser, a first-stage backflow device and a second-stage volute, and the first-stage flow channel, the first-stage diffuser, the first-stage backflow device, the second-stage flow channel and the second-stage volute are sequentially communicated to form a compressor flow channel. Gas enters the first-stage flow channel, and first-stage pressurization is achieved after the impeller does work on the gas. Gas enters the second-stage flow channel through the first-stage diffuser and the first-stage backflow device; after the impeller does work on the gas again, secondary pressurization is achieved; and finally, the gas is discharged through the second-stage volute. In the process of first-stage pressurization and second-stage pressurization, through the structural design of the impeller and the machine shell of the integrated shaft structure, vibration noise can be reduced, the service life of the compressor can be guaranteed easily, and the reliability of the compressor in the using process can be improved easily. The invention further discloses the magnetic suspension air conditioner.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refrigeration equipment, for example to a magnetic suspension compressor and a magnetic suspension air conditioner. BACKGROUND

[0002] The centrifugal compressor for a water chiller is the core component of the chiller. The low-temperature and low-pressure refrigerant gas is compressed by the centrifugal compressor to become high-temperature and high-pressure refrigerant gas. The high-temperature and high-pressure refrigerant gas is condensed into high-temperature and high-pressure refrigerant liquid by taking away heat through the condenser. The refrigerant liquid is expanded by the expansion valve and other expansion devices to become a low-temperature and low-pressure refrigerant gas-liquid mixture. The low-temperature and low-pressure refrigerant gas-liquid mixture is evaporated into low-temperature and low-pressure refrigerant gas after absorbing heat in the evaporator. The refrigerant gas is sucked into the centrifugal compressor again to enter the next cycle. In the whole process, the refrigerant absorbs heat in the evaporator and releases heat in the condenser, which is externally manifested as heat transfer, thereby realizing refrigeration.

[0003] The impeller blades of the centrifugal compressor accelerate the gas to the diffuser through high-speed rotation of the impeller. The high-speed gas is decelerated in the diffuser. According to Bernoulli's principle, the dynamic pressure is converted into static pressure, and the kinetic energy is converted into pressure energy to increase the pressure of the gas. If there is a next stage of gas compressed by a stage of compression, it enters the second stage of impeller through the bend and return flow device, and undergoes the same process as above to realize two-stage pressure increase. If necessary, subsequent stages of impeller can be provided to repeat the above process to realize three-stage pressure increase, four-stage pressure increase, etc.

[0004] The existing centrifugal compressor impeller needs a long main shaft to string the impeller to form a rotating component. From the perspective of rotor dynamics, the whole rotating component is a flexible shaft (the working speed is higher than the critical speed), so there is a resonance problem across the critical speed. When the compressor starts, the speed increases to the working speed, and the critical speed must be crossed. Crossing the critical speed will cause severe vibration, affecting the service life of the shaft and bearing. In addition, the first stage of impeller and the second stage of impeller need to be made separately and fitted on the shaft, which is complex and troublesome to assemble, and there is an assembly precision problem.

[0005] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present application, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0006] To provide a basic understanding of some aspects of the disclosed embodiments, the following brief summary is given. The summary is not an extensive overview of the application, nor is it intended to identify key / critical elements of the application or to delineate the scope of the embodiments. Rather, the sole purpose of the summary is to present some concepts of the embodiments in a simplified form as a prelude to the more detailed description that is presented later.

[0007] The magnetic suspension compressor and the magnetic suspension air conditioner provided by the embodiments of the present application solve the problems of compressor vibration and assembly.

[0008] In some embodiments, the magnetic suspension compressor comprises: a casing configured with a receiving cavity; an impeller in an axial structure, arranged in the receiving cavity; wherein the impeller is provided with a first flow channel and a second flow channel, the casing is provided with a first diffuser, a first return flow device and a second volute, the first flow channel, the first diffuser, the first return flow device, the second flow channel and the second volute are sequentially communicated to form a compressor flow channel.

[0009] In the process of first-stage pressurization and second-stage pressurization, the structural design of the impeller in the axial structure and the casing can reduce vibration noise, which not only helps to ensure the service life of the compressor, but also helps to improve the reliability of the compressor in use.

[0010] In some embodiments, the casing is further provided with a first bend, two ends of the first bend are respectively communicated with the first diffuser and the first return flow device. The first bend helps the gas in the first diffuser to flow smoothly to the first return flow device.

[0011] In some embodiments, the casing comprises: a gas inlet communicated with the inlet of the first flow channel of the impeller; a gas outlet communicated with the outlet of the second volute. The low-temperature and low-pressure gas flows into the compressor flow channel through the gas inlet, and after being pressurized, the high-temperature and high-pressure gas flows out from the gas outlet, ensuring the compression effect of the compressor.

[0012] In some embodiments, the receiving cavity comprises opposite open ends and a closed end, the open end is communicated with the gas inlet of the casing, and the axis of the receiving cavity is arranged in line with the axis of the impeller.

[0013] The opposite end of the open end of the receiving cavity is the closed end, and the in-line design of the receiving cavity and the impeller not only meets the self-rotation in the receiving cavity, but also serves the purpose of supporting and limiting the impeller.

[0014] In some embodiments, the magnetic suspension compressor further comprises: a motor rotor winding arranged around the outer side wall of the impeller; a motor stator winding arranged around the side wall of the receiving cavity and corresponding to the motor rotor winding; wherein an electromagnetic air gap is left between the motor rotor winding and the motor stator winding.

[0015] In this embodiment, the motor rotor winding is arranged directly on the impeller as a rotor, and the motor stator winding is arranged at the corresponding position of the casing, which can be understood as an integrated design of the impeller and the motor. Therefore, it is not necessary to separately design a motor and a separate shaft structure for the motor, thereby effectively shortening the overall length in the axial direction and making the overall structure of the compressor more compact.

[0016] In some embodiments, the outer side wall of the impeller is provided with an annular groove for mounting the motor rotor winding.

[0017] Fixing the motor rotor winding through the annular groove not only helps to quickly install the motor rotor winding and the impeller, thereby improving assembly efficiency, but also prevents the motor rotor winding from being displaced, that is, the annular groove limits the motor rotor winding.

[0018] In some embodiments, the magnetic levitation compressor also includes: a first thrust magnetic bearing, which is provided in the casing and abuts against one axial end face of the impeller; a second thrust magnetic bearing, which is provided in the casing and abuts against the other axial end face of the impeller; wherein the first thrust magnetic bearing and the second thrust magnetic bearing are arranged correspondingly to limit the axial displacement of the impeller.

[0019] Thrust magnetic bearings are arranged on the two end faces of the impeller in the axial direction, which can limit the axial displacement of the impeller. In addition, there is no need to reserve space for installing bearings on the impeller or the rotating shaft of the existing driving impeller, making the overall structure of the compressor more compact.

[0020] In some embodiments, the magnetic levitation compressor further includes: a radial magnetic bearing assembly, disposed in the casing and surrounding the outer wall of the impeller, for limiting the radial displacement of the impeller.

[0021] The radial magnetic bearing assembly is arranged on the radial outer wall of the impeller to limit the radial displacement of the impeller, which also helps to improve the compactness of the overall structure of the compressor.

[0022] In some embodiments, the magnetic levitation compressor further includes: a sealing assembly, which is provided on the air outlet side of the primary flow channel and / or the air outlet side of the secondary flow channel to prevent air leakage.

[0023] By arranging the sealing components on the outlet side of the primary flow channel and the outlet side of the secondary flow channel, the compressor airflow can be prevented from leaking toward the air inlet. In addition, air leakage between the primary and secondary boosting can be avoided, thereby affecting the overall boosting effect.

[0024] In some embodiments, the magnetic levitation air conditioner includes: the magnetic levitation compressor provided in the aforementioned embodiments.

[0025] The magnetic levitation compressor and magnetic levitation air conditioner provided by the embodiments of the present disclosure can achieve the following technical effects:

[0026] The integrated impeller integrates the first and second impellers into a rotating shaft structure. Since the length-diameter ratio of the shaft is very small, the critical speed is very high, and the shaft can be regarded as a rigid shaft, so there is no problem of crossing the critical speed (the working speed is lower than the critical speed). The gas enters the first flow channel, and the impeller does work on the gas to realize the first-stage pressurization. The gas passes through the first-stage diffuser and the first-stage reflux device to enter the second flow channel. The impeller does work on the gas again to realize the second-stage pressurization. Finally, the gas is discharged through the second-stage volute. In the process of first-stage pressurization and second-stage pressurization, the structure design of the integrated shaft structure of the impeller and the casing can reduce vibration noise, which not only helps to ensure the service life of the compressor, but also helps to improve the reliability of the compressor in use.

[0027] The foregoing general description and the following description are only exemplary and explanatory, and are not used to limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0028] One or more embodiments are exemplarily illustrated by corresponding drawings, which do not constitute limitation on the embodiments, elements with the same reference numerals in the drawings are shown as similar elements, the drawings do not constitute proportional limitation, and wherein:

[0029] Figure 1 is a cross-sectional view of a magnetic suspension compressor provided by an embodiment of the present disclosure;

[0030] Figure 2 is a partial cross-sectional view of a magnetic suspension compressor provided by an embodiment of the present disclosure;

[0031] Figure 3 is another structure schematic view of a magnetic suspension compressor provided by an embodiment of the present disclosure;

[0032] Figure 4 is another structure schematic view of a magnetic suspension compressor provided by an embodiment of the present disclosure;

[0033] Figure 5 is another structure schematic view of a magnetic suspension compressor provided by an embodiment of the present disclosure;

[0034] Figure 6 is another structure schematic view of a magnetic suspension compressor provided by an embodiment of the present disclosure.

[0035] Reference signs:

[0036] 10: casing; 101: accommodating cavity; 102: gas inlet; 103: gas outlet; 104: groove;

[0037] 20: impeller; 201: first flow channel; 202: second flow channel; 203: annular groove;

[0038] 30: first diffuser; 40: first return channel; 50: second volute; 60: first bend;

[0039] 70: motor rotor winding; 80: motor stator winding;

[0040] 901: first thrust magnetic bearing; 902: second thrust magnetic bearing;

[0041] 111: first radial magnetic bearing; 112: second radial magnetic bearing;

[0042] 121: first seal; 122: second seal. DETAILED DESCRIPTION

[0043] In order to enable a more detailed understanding of the features and technical content of the embodiments of the present disclosure, the implementation of the embodiments of the present disclosure is described in detail below, and the attached drawings are used for reference only and do not limit the embodiments of the present disclosure. In the following technical description, in order to facilitate explanation, through multiple details, a sufficient understanding of the disclosed embodiments is provided. However, one or more embodiments can still be implemented without these details. In other cases, in order to simplify the drawings, well-known structures and devices can be simplified.

[0044] The terms "first", "second", and the like in the specification and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present disclosure described herein can be implemented. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0045] In the embodiments of the present disclosure, the terms "upper", "lower", "inner", "middle", "outer", "front", "back", and the like indicate the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the embodiments of the present disclosure and its embodiments, and are not used to limit the indicated devices, elements or components must have a specific orientation, or be constructed and operated in a specific orientation. And, in addition to indicating the orientation or positional relationship, the above-mentioned terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain attachment relationship or connection relationship in some cases. For those skilled in the art, the specific meaning of these terms in the embodiments of the present disclosure can be understood according to the specific circumstances.

[0046] In addition, the terms "set", "connected", and "fixed" should be understood broadly. For example, "connected" can be fixed connection, detachable connection, or integral configuration; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection via an intermediate medium, or internal communication between two devices, elements, or components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the embodiments of the present disclosure according to specific circumstances.

[0047] Unless otherwise specified, the term "plurality" means two or more.

[0048] In the embodiments of the present disclosure, the character " / " represents an "or" relationship between the preceding and following objects. For example, A / B represents: A or B.

[0049] The term "and / or" is a description of the association relationship between objects, which means that there can be three relationships. For example, A and / or B means: A or B, or, A and B, the three relationships.

[0050] It should be noted that the embodiments in the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0051] In combination Figures 1 to 6 As shown in the drawings, the embodiments of the present disclosure provide a magnetic suspension compressor, comprising: a casing 10 and an impeller 20. The casing 10 is configured with a receiving cavity 101; the impeller 20 is an axial structure and is arranged in the receiving cavity 101; wherein the impeller 20 is provided with a primary flow passage 201 and a secondary flow passage 202, the casing 10 is provided with a primary diffuser 30, a primary return flow device 40 and a secondary volute 50, and the primary flow passage 201, the primary diffuser 30, the primary return flow device 40, the secondary flow passage 202 and the secondary volute 50 are sequentially communicated to form a compressor flow passage.

[0052] The magnetic suspension compressor provided by the embodiments of the present disclosure adopts an integrated impeller 20, integrates the primary and secondary impellers 20 into a rotary shaft structure. Since the length-diameter ratio of the shaft is very small, the critical speed is very high, which can be regarded as a rigid shaft, so there is no problem of crossing the critical speed (the working speed is lower than the critical speed). The gas enters the primary flow passage 201, and the impeller 20 does work on the gas to realize primary pressure increase. The gas passes through the primary diffuser 30 and the primary return flow device 40 to enter the secondary flow passage 202. The impeller 20 does work on the gas again to realize secondary pressure increase. Finally, the gas is discharged through the secondary volute 50. In the process of primary pressure increase and secondary pressure increase, the structure design of the integrated shaft structure of the impeller 20 and the casing 10 can reduce vibration noise, which not only helps to ensure the service life of the compressor, but also helps to improve the reliability of the compressor in use.

[0053] The magnetic suspension compressor (hereinafter referred to as "compressor") is one of the core components of the magnetic suspension air conditioner. The low-temperature and low-pressure gas is compressed into high-temperature and high-pressure gas in the compressor flow channel through the process of pressure increase, and then discharged. In this embodiment, the compressor includes a casing 10 and an impeller 20, which is a rotor. The impeller 20 rotates around its own axis in the casing 10 relative to the casing 10. The impeller 20 in this embodiment integrates a two-stage impeller 20 structure and is a one-piece structure. The impeller 20 forms a first flow channel 201 and a second flow channel 202 inside. The first flow channel 201 and the second flow channel 202 correspond to the first-stage pressure increase process and the second-stage pressure increase process, respectively.

[0054] Optionally, the casing 10 is further provided with a first bend 60, and the two ends of the first bend 60 are respectively communicated with the first diffuser 30 and the first return flow device 40. The first bend 60 helps the gas in the first diffuser 30 to flow smoothly to the first return flow device 40.

[0055] The first flow channel 201, the first diffuser 30, the first bend 60, the first return flow device 40, the second flow channel 202 and the second volute 50 are sequentially communicated to form a compressor flow channel. The gas enters the first flow channel 201, and the impeller 20 does work on the gas to achieve first-stage pressure increase. The gas enters the second flow channel 202 through the first diffuser 30, the first bend 60 and the first return flow device 40. The impeller 20 does work on the gas again to achieve second-stage pressure increase. Finally, the gas is discharged through the second volute 50. The low-temperature and low-pressure gas is compressed into high-temperature and high-pressure gas after passing through the first-stage pressure increase and the second-stage pressure increase in the compressor flow channel, and then discharged.

[0056] Optionally, the casing 10 includes: a gas inlet 102 communicated with the inlet of the first flow channel 201 of the impeller 20; and a gas outlet 103 communicated with the outlet of the second volute 50. The low-temperature and low-pressure gas flows into the compressor flow channel through the gas inlet 102, and is compressed into high-temperature and high-pressure gas after pressure increase, and then flows out from the gas outlet 103, thereby ensuring the compression effect of the compressor.

[0057] The gas inlet 102 is communicated with the inlet of the first flow channel 201 of the impeller 20, wherein the flow area of the gas inlet 102 is greater than the flow area of the inlet of the first flow channel 201, and the projection of the gas inlet 102 covers at least all the inlets of the first flow channel 201 of the impeller 20. In this way, it can be ensured that the gas flow from the gas inlet 102 can enter the first flow channel 201 of the impeller 20.

[0058] The gas outlet 103 is communicated with the outlet of the second volute 50, and the high-temperature and high-pressure gas in the compressor flow channel after the second pressure increase is discharged from the second volute 50 through the gas outlet.

[0059] Optionally, the accommodating cavity 101 comprises opposite open end and closed end, the open end communicates with the air inlet 102 of the casing 10, and the axis of the accommodating cavity 101 is arranged in line with the axis of the impeller 20.

[0060] The closed end opposite to the open end of the accommodating cavity 101, the in-line design of the accommodating cavity 101 and the impeller 20 can not only meet the self-rotation in the accommodating cavity 101, but also play the supporting and limiting purpose for the impeller 20.

[0061] In the embodiment, the impeller 20 is a rotor, and does not need a stator and a motor, so that the design of the closed end of the accommodating cavity 101 can not only further ensure the supporting and limiting effect for the impeller 20, but also avoid foreign matters from entering the accommodating cavity 101, so as to affect the rotation of the impeller 20.

[0062] Optionally, the magnetic suspension compressor further comprises: a motor rotor winding 70 arranged around the outer side wall of the impeller 20; a motor stator winding 80 arranged around the side wall of the accommodating cavity 101 and corresponding to the motor rotor winding 70; wherein the motor rotor winding 70 and the motor stator winding 80 are left with an electromagnetic air gap. Figure 3 and Figure 4 as shown.

[0063] In the embodiment, the motor rotor winding 70 is directly arranged on the impeller 20 as a rotor, and the motor stator winding 80 is arranged at the corresponding position of the casing 10, which can be understood as the integrated design of the impeller 20 and the motor, without separately designing the motor and separately arranging a shaft structure for the motor, so as to effectively shorten the overall length in the axial direction, and make the overall structure of the compressor more compact.

[0064] Through the electromagnetic air gap, on the one hand, the motor rotor winding 70 can avoid interference with the motor stator winding 80 when the impeller 20 rotates, and on the other hand, the magnetic force between the motor rotor winding 70 and the motor stator winding 80 can be ensured, so as to ensure the driving of the impeller 20 and achieve the purpose of self-rotation of the impeller 20 around its axis.

[0065] Optionally, the motor rotor winding 70 is located between the outlet of the first flow channel 201 and the outlet of the second flow channel 202, and is arranged close to the outlet of the second flow channel 202. In addition, the motor rotor winding 70 avoids the first backflow device 40 to avoid interference during rotation.

[0066] The motor rotor winding 70 is wound on the outer side wall of the impeller 20 and is fixed to avoid displacement during rotation, so as to affect the interaction between the motor rotor winding 70 and the motor stator winding 80, and further affect the rotation of the impeller 20.

[0067] Optionally, the side wall of the accommodating cavity 101 is provided with a groove 104, which is arranged along the circumference of the accommodating cavity 101. The motor stator winding 80 is arranged in the groove 104, so that it not only avoids interference with the impeller 20 and the motor rotor winding 70, but also ensures its fixing effect and avoids its deviation. Especially during installation and positioning, the motor stator winding 80 is quickly installed in place through the groove 104, improving the assembly efficiency.

[0068] It should be noted that the electromagnetic air gap between the motor rotor winding 70 and the motor stator winding 80 is determined according to the actual situation, and is not specifically limited here.

[0069] Optionally, the outer side wall of the impeller 20 is provided with an annular groove 203, which is used to install the motor rotor winding 70.

[0070] The motor rotor winding 70 is fixedly installed through the annular groove 203, which not only helps the motor rotor winding 70 and the impeller 20 to be quickly installed in place, improving the assembly efficiency, but also can avoid the displacement of the motor rotor winding 70, i.e. the annular groove 203 limits the motor rotor winding 70.

[0071] Optionally, the outer surface of the motor rotor winding 70 is coplanar with the outer surface of the impeller 20, or slightly lower than the outer surface of the impeller 20. In this way, not only is it helpful for assembly, but it also further makes the overall structure of the compressor more compact and reduces the occupied space.

[0072] Optionally, the magnetic suspension compressor further comprises: a first thrust magnetic bearing 901 arranged on the casing 10 and abutting against one end surface of the impeller 20 in the axial direction; a second thrust magnetic bearing 902 arranged on the casing 10 and abutting against the other end surface of the impeller 20 in the axial direction; wherein the first thrust magnetic bearing 901 and the second thrust magnetic bearing 902 are correspondingly arranged to limit the axial displacement of the impeller 20. Figure 5 As shown.

[0073] The thrust magnetic bearings are arranged on the two end surfaces of the impeller 20 in the axial direction, which can limit the displacement of the impeller 20 in the axial direction, and in addition, there is no need to reserve space for installing bearings on the impeller 20 or the existing shaft for driving the impeller 20, making the overall structure of the compressor more compact.

[0074] The first thrust magnetic bearing 901 and the second thrust magnetic bearing 902 are embedded in the casing 10, which fully utilizes the side wall of the casing 10 under the condition of ensuring its functional effect, avoids the need to reserve installation space, and further improves the compactness of the overall structure of the compressor.

[0075] Optionally, the first thrust magnetic bearing 901 and the second thrust magnetic bearing 902 are coaxially arranged. In this way, it is helpful for the overall force balance of the impeller 20.

[0076] Optionally, the first thrust magnetic bearing 901, the impeller 20 and the second thrust magnetic bearing 902 are coaxially arranged. In this way, not only the overall force balance of the impeller 20 is facilitated, but also the stability of the impeller 20 during rotation is further ensured.

[0077] Optionally, the magnetic suspension compressor further comprises a radial magnetic bearing group arranged on the outer side wall of the impeller 20 and surrounding the casing 10, for limiting the radial displacement of the impeller 20.

[0078] The radial magnetic bearing group arranged on the outer side wall of the impeller 20 in the radial direction can limit the displacement of the impeller 20 in the radial direction. In this way, the compactness of the overall structure of the compressor is also improved.

[0079] The radial magnetic bearing group is embedded in the casing 10, which makes full use of the side wall of the casing 10 while ensuring its functional role, avoids the need to reserve installation space, and further improves the compactness of the overall structure of the compressor.

[0080] Optionally, the radial magnetic bearing group comprises a first radial magnetic bearing 111 and a second radial magnetic bearing 112, wherein the first radial magnetic bearing 111 and the second radial magnetic bearing 112 are preferentially arranged at the end of the impeller 20 to ensure the supporting effect and limiting action on the end of the impeller 20. In combination with the Figure 6 illustrated.

[0081] Exemplarily, the first radial magnetic bearing 111 is arranged close to the first thrust magnetic bearing 901, and the second radial magnetic bearing 112 is arranged close to the second thrust magnetic bearing 902.

[0082] Optionally, the magnetic suspension compressor further comprises a sealing assembly arranged on the outlet 103 side of the primary flow passage 201 and / or the outlet 103 side of the secondary flow passage 202, for preventing air leakage. By arranging the sealing assembly on the outlet 103 side of the primary flow passage 201 and the outlet 103 side of the secondary flow passage 202, the air flow of the compressor can be prevented from leaking towards the inlet 102, and air leakage between the primary pressure increase and the secondary pressure increase can also be avoided, thereby affecting the overall pressure increase effect.

[0083] Optionally, the sealing assembly comprises a first sealing member 121 arranged on the connecting section of the outlet 103 of the primary flow passage 201 and the primary diffuser 30, and embedded in the casing 10.

[0084] Optionally, the sealing assembly further comprises a second sealing member 122 arranged on the connecting section of the outlet 103 of the secondary flow passage 202 and the secondary volute 50, and embedded in the casing 10.

[0085] The embodiment of the present disclosure provides a magnetic levitation air conditioner, which comprises the magnetic levitation compressor provided in the above embodiment. The magnetic levitation compressor comprises a shell 10 and an impeller 20. The shell 10 is configured with a containing cavity 101; the impeller 20 is an axial structure and is arranged in the containing cavity 101; wherein the impeller 20 is provided with a first flow channel 201 and a second flow channel 202, the shell 10 is provided with a first diffuser 30, a first return flow device 40 and a second volute 50, and the first flow channel 201, the first diffuser 30, the first return flow device 40, the second flow channel 202 and the second volute 50 are sequentially communicated to form a compressor flow channel.

[0086] The magnetic levitation air conditioner provided by the embodiment of the present disclosure adopts an integrated impeller 20, integrates the first and second impellers 20 into a rotary shaft structure, the critical speed of the shaft is very high due to the small length-diameter ratio of the shaft, the shaft can be regarded as a rigid shaft, so there is no problem of crossing the critical speed (the working speed is lower than the critical speed); the gas enters the first flow channel 201, the impeller 20 does work on the gas to realize first-stage pressure increase; the gas passes through the first diffuser 30 and the first return flow device 40 to enter the second flow channel 202; the impeller 20 does work on the gas again to realize second-stage pressure increase; finally, the gas is discharged through the second volute 50. In the process of first-stage pressure increase and second-stage pressure increase, the structure design of the integrated shaft structure of the impeller 20 and the shell 10 can reduce vibration noise, which not only helps to ensure the service life of the compressor, but also helps to improve the reliability of the compressor in use. In addition, in the embodiment, the motor rotor winding 70 is arranged directly on the impeller 20 as a rotor, and the motor stator winding 80 is arranged at the corresponding position of the shell 10, which can be understood as integrating the impeller 20 and the motor, and the motor and a section of shaft structure arranged for the motor are designed separately, so that the overall length in the axial direction is effectively shortened, and the overall structure of the compressor becomes more compact.

[0087] The above description and drawings sufficiently show the embodiments of the present disclosure to enable a person skilled in the art to practice them. Other embodiments can include structural and other changes. The embodiments only represent possible changes. Unless explicitly required, individual components and functions are optional, and the order of operations can be changed. Some parts and features of some embodiments can be included in or replace parts and features of other embodiments. The embodiments of the present disclosure are not limited to the structures described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present disclosure is only limited by the appended claims.

Claims

1. A magnetic levitation compressor characterized by, The magnetic suspension compressor comprises: a casing configured with a receiving cavity; a vane wheel in an axial structure, arranged in the receiving cavity; wherein the vane wheel is provided with a first flow channel and a second flow channel, the casing is provided with a first diffuser, a first backflow device and a second volute, and the first flow channel, the first diffuser, the first backflow device, the second flow channel and the second volute are sequentially communicated to form a compressor flow channel.

2. The magnetic suspension compressor according to claim 1, wherein the casing is further provided with a first curved channel, and two ends of the first curved channel are communicated with the first diffuser and the first backflow device respectively.

3. The magnetic levitation compressor of claim 1, wherein, The casing comprises: an air inlet communicated with an inlet of the first flow channel of the vane wheel; an air outlet communicated with an outlet of the second volute.

4. The magnetic suspension compressor according to claim 1, wherein the receiving cavity comprises opposite open ends and a closed end, the open end is communicated with the air inlet of the casing, and an axis of the receiving cavity is arranged in line with an axis of the vane wheel.

5. The magnetic levitation compressor of claim 1, wherein, Further comprising: a motor rotor winding arranged around an outer side wall of the vane wheel; a motor stator winding arranged around a side wall of the receiving cavity and corresponding to the motor rotor winding; wherein an electromagnetic air gap is left between the motor rotor winding and the motor stator winding.

6. The magnetic suspension compressor according to claim 5, wherein the outer side wall of the vane wheel is provided with an annular groove for mounting the motor rotor winding.

7. The magnetic levitation compressor of claim 1, wherein, Further comprising: a first thrust magnetic bearing arranged in the casing and abutting an axial one end surface of the vane wheel; a second thrust magnetic bearing arranged in the casing and abutting an axial other end surface of the vane wheel; wherein the first thrust magnetic bearing and the second thrust magnetic bearing are arranged correspondingly to limit axial displacement of the vane wheel.

8. The magnetic levitation compressor of claim 1, wherein, Further comprising: a radial magnetic bearing group arranged in the casing and around the outer side wall of the vane wheel, for limiting radial displacement of the vane wheel.

9. The magnetic levitation compressor of any one of claims 1 to 8, characterized by Further comprising: a sealing assembly arranged at the air outlet side of the first flow channel and / or the air outlet side of the second flow channel, for preventing air leakage.

10. A magnetic levitation air conditioner, characterized by, The magnetic suspension compressor according to any one of claims 1 to 9.

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