CN113898604A

CN113898604A - Bearing system, refrigeration equipment, centrifugal compressor and control method and device of centrifugal compressor

Info

Publication number: CN113898604A
Application number: CN202111176591.4A
Authority: CN
Inventors: 刘胜; 刘树清; 贺伟衡; 吴昕; 李逸信; 李镇杉; 闵攀; 叶利超
Original assignee: Midea Group Co Ltd; GD Midea Heating and Ventilating Equipment Co Ltd
Current assignee: Midea Group Co Ltd; GD Midea Heating and Ventilating Equipment Co Ltd; Guangdong Midea HVAC Equipment Co Ltd
Priority date: 2021-10-09
Filing date: 2021-10-09
Publication date: 2022-01-07

Abstract

The embodiment of the invention provides a bearing system, refrigeration equipment, a centrifugal compressor and a control method and device thereof, wherein the bearing system comprises: a rotating shaft; the first bearing assembly is sleeved on the rotating shaft; the first bearing assembly includes: the first air bearing is provided with a first bearing surface, the first bearing surface faces the rotating shaft, and a first gap is formed between the first bearing surface and the outer surface of the rotating shaft; the first magnetic suspension bearing and the first air suspension bearing are axially arranged and connected. That is to say, integrate first air bearing and first magnetic suspension bearing into a part to can effectively reduce the quantity of spare part on the pivot, and then shorten the length of pivot cantilever end, thus critical speed and isolation margin when can improve the pivot and rotate makes the rotation process of pivot more stable.

Description

Bearing system, refrigeration equipment, centrifugal compressor and control method and device of centrifugal compressor

Technical Field

The embodiment of the invention relates to the technical field of compressor equipment, in particular to a bearing system, a centrifugal compressor, refrigeration equipment, a control method of the centrifugal compressor, a control device of the centrifugal compressor and a readable storage medium.

Background

Magnetic suspension bearings are widely used in the industrial field because they are free of oil and friction loss. At present, magnetic bearings are slowly used in the refrigeration industry as support systems for the rotors of centrifugal compressors, however, they require power supply and have extremely complex control systems, and therefore, failure is inevitable. Moreover, in the event of a power outage, the rotor also needs to idle for a period of time. In the related art, the protection bearing is used for preventing the magnetic suspension bearing from colliding with the rotor under abnormal conditions such as failure or power failure.

However, the addition of the protective bearing increases the length of the cantilever end of the rotor, reduces the critical speed of the rotor, and because no lubricant can be present in the system, the protective bearing is in a dry friction state, and the service life of the protective bearing is greatly reduced.

Disclosure of Invention

Embodiments of the present invention are directed to solving at least one of the technical problems occurring in the prior art.

To this end, a first aspect of an embodiment of the present invention provides a bearing system.

A second aspect of embodiments of the present invention provides a centrifugal compressor.

A third aspect of embodiments of the present invention provides a refrigeration apparatus.

A fourth aspect of the embodiments of the present invention provides a control method of a centrifugal compressor.

A fifth aspect of embodiments of the present invention provides a control apparatus of a centrifugal compressor.

A sixth aspect of embodiments of the present invention provides a centrifugal compressor.

A seventh aspect of embodiments of the present invention provides a refrigeration apparatus.

An eighth aspect of embodiments of the present invention provides a readable storage medium.

In view of this, according to a first aspect of embodiments of the present invention, there is provided a bearing system comprising: a rotating shaft; the first bearing assembly is sleeved on the rotating shaft; the first bearing assembly includes: the first air bearing is provided with a first bearing surface, the first bearing surface faces the rotating shaft, and a first gap is formed between the first bearing surface and the outer surface of the rotating shaft; the first magnetic suspension bearing and the first air suspension bearing are axially arranged and connected.

The bearing system provided by the embodiment of the invention comprises a rotating shaft and a first bearing assembly, and particularly, the first bearing assembly is sleeved on the rotating shaft, so that the rotating shaft is supported in the high-speed rotating process of the rotating shaft, and the operation stability of a centrifugal compressor with the bearing system is ensured.

The first bearing assembly comprises a first air bearing and a first magnetic suspension bearing, and specifically, the first air bearing and the first magnetic suspension bearing are arranged along the axial direction of the rotating shaft and are connected with the first magnetic suspension bearing, that is, the first air bearing and the first magnetic suspension bearing are integrated into one part, so that the number of parts on the rotating shaft can be effectively reduced, the length of a cantilever end of the rotating shaft can be further shortened, the critical speed and the isolation margin of the rotating shaft during rotation can be improved, and the rotating process of the rotating shaft is more stable. In addition, during the working process of the centrifugal compressor, the first magnetic suspension bearing can bear part of load, so that the structure of the first magnetic suspension bearing can be correspondingly reduced, and the miniaturization of the centrifugal compressor is realized.

Furthermore, the first air bearing comprises a first bearing surface, and the first bearing surface is arranged towards the rotating shaft, that is, the inner surface of one side of the first air bearing, which faces the rotating shaft, is the first bearing surface. Specifically, a first gap is formed between the first bearing surface and the outer surface of the rotating shaft, external air enters the first gap through a channel on the first air bearing, and then the rotating shaft is supported through the air, so that the stability of the rotating shaft in the high-speed rotating process is ensured.

Moreover, when the magnetic suspension bearing is in failure or power failure and other abnormal conditions, the first air bearing can be used as a protection bearing, so that when the magnetic suspension bearing is in failure or power failure and other abnormal conditions, the rotating shaft can be effectively prevented from colliding with the magnetic suspension bearing, and simultaneously can be supported through gas, and the problem that the service life of the protection bearing is reduced due to dry friction between the rotating shaft and the protection bearing can be effectively avoided under the condition that the magnetic suspension bearing is in failure or power failure and other abnormal conditions.

In concrete application, centrifugal compressor still includes power supply unit and air feeder, and specifically, power supply unit is used for supplying power for first magnetic suspension bearing, and first magnetic suspension bearing produces the electromagnetic force under the circumstances of circular telegram, and then realizes the support to the rotating shaft, and it can be understood that, through the electric current size that control power supply unit provided, can make first magnetic suspension bearing produce the electromagnetic force of equidimension not to the realization adopts different holding power to support the rotating shaft.

The gas supply device is used for supplying gas to the first gap, and then the support of the rotating shaft is realized through the gas. It can be understood that the different supporting forces of the rotating shaft can be supported by controlling the flow rate or flow velocity of the gas introduced by the gas supply device.

Therefore, the load distribution of the first bearing assembly carried by the shaft can be realized by controlling the magnitude of the current led into the first magnetic suspension bearing and/or the flow velocity of the air flow led into the first gap, so that the first magnetic suspension bearing can carry a certain amount of load according to actual needs, the structure of the first magnetic suspension bearing is correspondingly reduced, and the miniaturization of the centrifugal compressor is realized.

In addition, the centrifugal compressor can further comprise a position sensor and a controller, the position sensor and the controller are used for detecting the vibration condition of the bearing system and sending the vibration condition to the controller, the controller adjusts the current led into the first magnetic suspension bearing and/or the flow speed of the air flow led into the first gap according to the vibration condition of the bearing system, and therefore the rigidity and the damping of the bearing system are changed, and the stability and the reliability of the rotating process of the rotating shaft are improved.

It should be noted that, when it is determined that the first magnetic bearing is in an abnormal condition such as failure or power failure, the rotating shaft continues to rotate, and the supporting force of the first magnetic bearing on the rotating shaft can be improved by increasing the flow rate or flow velocity of the gas introduced into the first gap. Or, when the vibration generated by the bearing system is judged to be larger, the supporting force of the first bearing assembly on the rotating shaft can be improved by increasing the current value of the first magnetic suspension bearing and/or increasing the flow or flow speed of the gas introduced into the first gap, so that the rotating process of the rotating shaft is more stable and reliable.

In a specific application, the first magnetic bearing is a radial magnetic bearing.

In addition, the bearing system provided by the above technical solution of the present invention further has the following additional technical features:

in one possible design, the bearing system further comprises a first air flow passage provided to the first bearing assembly, a first end of the first air flow passage communicating with the first gap, and a second end of the first air flow passage for communicating with the air supply.

In this design, the bearing system is defined to further include a first air flow passage, and specifically, the first air flow passage is provided on the first bearing assembly, and one end of the first air flow passage communicates with the first gap and the other end of the first air flow passage communicates with the air supply device. Specifically, when the centrifugal compressor operates, the rotating shaft rotates, the gas supply device supplies gas to the first gap through the first gas flow channel, and then the rotating shaft is supported through the gas flow, so that the first gas bearing can bear partial load, the structure of the first magnetic suspension bearing can be correspondingly reduced, and the miniaturization of the centrifugal compressor is realized.

In addition, under the unusual circumstances such as inefficacy or outage appear in the magnetic suspension bearing, can regard as the protection bearing through first air bearing, and then under the unusual circumstances such as inefficacy or outage appear in the magnetic suspension bearing, when can effectively preventing to bump between pivot and the magnetic suspension bearing, support the pivot through gaseous, can also effectively avoid taking place dry friction and leading to the problem that protection bearing life reduces between pivot and the protection bearing under the unusual circumstances such as inefficacy or outage appear in the magnetic suspension bearing.

In one possible design, the first air flow channel includes a first channel and a second channel, wherein the first channel is disposed on the first air bearing, a first end of the first channel is communicated with the first gap, the second channel is disposed on the first magnetic suspension bearing, a first end of the second channel is communicated with a second end of the first channel, and a second end of the second channel is used for being communicated with the air supply device.

In this design, the first air flow passage is defined to include a first passage and a second passage, and specifically, the first passage is provided on the first air bearing, and one end of the first passage communicates with the first gap. The second channel is arranged on the first magnetic suspension bearing, one end of the second channel is communicated with the other end of the first channel, and the other end of the second channel is communicated with the gas supply device. Therefore, the gas supply device can lead gas into the first gap through the second channel and the first channel, and further support the rotating shaft through the gas. Therefore, the first magnetic suspension bearing can bear partial load, the structure of the first magnetic suspension bearing can be correspondingly reduced, and the miniaturization of the centrifugal compressor is realized.

In one possible design, the first air bearing includes a first communication member provided with a plurality of first communication holes, and the first end of the first air flow passage communicates with the first gap through the plurality of first communication holes.

In this design, it is defined that the first air bearing comprises a first communication member, in particular, a plurality of first communication holes are arranged on the first communication member, and the plurality of first communication holes are arranged on the first communication member at intervals. After passing through the second channel and the first channel, the gas of the gas supply device enters the first gap through the first communication holes, and then the support of the rotating shaft is realized through the gas. Between gaseous entering first clearance, can carry out the throttle to gaseous through first intercommunication piece, and then prevent that air flow or velocity of flow are too big and to the rotation process of pivot produce the influence, ensure the stability and the reliability of pivot operation process.

In a specific application, the number of the first through holes can be set according to actual needs. And the aperture of each first through hole is between 15 μm and 25 μm, specifically, the aperture of each first through hole may be 20 μm, and specifically, the aperture may be set according to actual needs.

In a possible design, the first air bearing further comprises a first bearing body, a first iron core, a second iron core and a thrust coil assembly, wherein the first iron core and the second iron core are arranged on the first bearing body, the thrust coil assembly is arranged on the first bearing body, and the first communicating piece is arranged on the thrust coil assembly.

In this design, it still includes the first bearing body to have injectd first air bearing, first iron core, second iron core and thrust coil assembly, specifically speaking, first iron core and second iron core set up on the first bearing body, the thrust coil assembly sets up on the first bearing body, first intercommunication piece sets up on the thrust coil assembly, when the thrust coil assembly circular telegram, through first iron core, produce the electromagnetic force under the combined action of second iron core and thrust coil assembly, and then support the pivot through this part of electromagnetic force and the electromagnetic force that first magnetic suspension bearing produced.

In one possible design, the bearing system further includes a second bearing assembly disposed around the shaft, the second bearing assembly being spaced apart from the first bearing assembly.

In the design, the bearing system is limited to further comprise a second bearing assembly, specifically, the second bearing assembly is sleeved on the rotating shaft and is arranged at intervals with the first bearing assembly, so that the rotating shaft is effectively supported, the balance of the supporting force of the rotating shaft is ensured, and the stability and the reliability of the rotating process of the rotating shaft are further improved.

In specific application, the first bearing assembly and the second bearing assembly are respectively arranged close to two ends of the rotating shaft, so that the balance of the supporting force of the rotating shaft is ensured, and the stability and the reliability of the rotating process of the rotating shaft are further improved. Thereby improving the operation stability and reliability of the centrifugal compressor with the bearing system.

In one possible design, the second bearing assembly includes a second air bearing and a second magnetic suspension bearing, wherein the second air bearing is provided with a second bearing surface, the second bearing surface is arranged towards the rotating shaft, a second gap is formed between the second bearing surface and the outer surface of the rotating shaft, the second magnetic suspension bearing and the second air bearing are axially arranged, and the second magnetic suspension bearing is connected with the second air bearing.

In the design, the second bearing assembly comprises a second air bearing and a second magnetic suspension bearing, specifically, the second air bearing and the second magnetic suspension bearing are arranged along the axial direction of the rotating shaft, and the second air bearing is connected with the second magnetic suspension bearing, that is, the second air bearing and the second magnetic suspension bearing are integrated into one part, so that the number of parts on the rotating shaft can be further reduced, the length of the cantilever end of the rotating shaft can be further shortened, the critical speed and the isolation margin during rotation of the rotating shaft can be improved, and the rotating process of the rotating shaft is more stable. In addition, in the working process of the centrifugal compressor, the second air bearing can bear part of load, so that the structure of the second magnetic suspension bearing can be correspondingly reduced, and the miniaturization of the centrifugal compressor is further realized.

Further, the second air bearing includes a second bearing surface, and the second bearing surface is disposed toward the rotating shaft, that is, an inner surface of the second air bearing facing the rotating shaft is the second bearing surface. Specifically, a second gap is formed between the second bearing surface and the outer surface of the rotating shaft, external air enters the second gap through a channel on the second air bearing, and then the rotating shaft is supported through the air, so that the stability of the rotating shaft in the high-speed rotating process is ensured.

And, under the unusual circumstances such as inefficacy or outage appear in the magnetic suspension bearing, can regard as the protection bearing through the second air bearing, make second air bearing support for the pivot jointly with first air bearing, and then under the unusual circumstances such as inefficacy or outage appear in the magnetic suspension bearing, when can effectively preventing to collide between pivot and the magnetic suspension bearing, support the pivot through gaseous, can also appear in the magnetic suspension bearing under the unusual circumstances such as inefficacy or outage, effectively avoid taking place dry friction and lead to the problem that protection bearing life reduces between pivot and the protection bearing.

In specific application, the power supply device is used for supplying power to the second magnetic suspension bearing, the second magnetic suspension bearing generates electromagnetic force under the power-on condition, and then the support of the rotating shaft is realized. The gas supply device is used for supplying gas to the second gap, and the support of the rotating shaft is realized through the gas. It can be understood that the different supporting forces of the rotating shaft can be supported by controlling the flow rate or flow velocity of the gas introduced by the gas supply device. Therefore, the load distribution of the second bearing assembly carried by the shaft can be realized by controlling the magnitude of the current led into the second magnetic suspension bearing and/or the flow velocity of the air flow led into the second gap, so that the second air bearing can carry a certain amount of load according to the actual requirement, the structure of the second magnetic suspension bearing is correspondingly reduced, and the miniaturization of the centrifugal compressor is realized.

In addition, the controller can also adjust the current led into the second magnetic suspension bearing and/or the flow velocity of the air flow led into the second gap according to the vibration condition of the bearing system, so that the rigidity and the damping of the bearing system are changed, and the stability and the reliability of the rotating process of the rotating shaft are improved.

It should be noted that, when it is determined that the second magnetic suspension bearing is in an abnormal condition such as failure or power failure, the rotating shaft continues to rotate, and the supporting force of the second air bearing on the rotating shaft can be improved by increasing the flow rate or flow velocity of the gas introduced into the second gap. Or, when the vibration generated by the bearing system is judged to be larger, the supporting force of the second bearing assembly on the rotating shaft can be improved by increasing the current value of the second magnetic suspension bearing and/or increasing the flow or flow speed of the gas introduced into the second gap, so that the rotating process of the rotating shaft is more stable and reliable.

In a specific application, the second magnetic bearing is a radial magnetic bearing.

In a possible design, the bearing system further includes a second air flow channel, the second air flow channel is disposed in the second air bearing, a first end of the second air flow channel is communicated with the second gap, and a second end of the second air flow channel is used for being communicated with the air supply device.

In this design, the bearing system is further defined to include a second air flow channel, specifically, the second air flow channel is disposed on the second air bearing, and one end of the second air flow channel is communicated with the second gap, and the other end of the second air flow channel is communicated with the air supply device. Specifically, when the centrifugal compressor operates, the rotating shaft rotates, the air supply device supplies air to the second gap through the second air flow channel, and the other end of the rotating shaft is supported through air flow, so that the second air bearing can bear partial load, the structure of the second magnetic suspension bearing can be correspondingly reduced, and the miniaturization of the centrifugal compressor is realized.

In addition, under the unusual circumstances such as inefficacy or outage appear in the magnetic suspension bearing, can regard as the protection bearing through the second air bearing, and then under the unusual circumstances such as inefficacy or outage appear in the magnetic suspension bearing, when can effectively preventing to bump between pivot and the magnetic suspension bearing, support the pivot through gaseous, can also effectively avoid taking place dry friction and leading to the problem that protection bearing life reduces between pivot and the protection bearing under the unusual circumstances such as inefficacy or outage appear in the magnetic suspension bearing.

In one possible design, the second air bearing includes a second communication member provided with a plurality of second communication holes through which the first end of the second air flow passage communicates with the second gap.

In this design, it is defined that the second air bearing includes a second communication member, and specifically, the second communication member is provided with a plurality of second communication holes, and the plurality of second communication holes are arranged at intervals on the second communication member. And the gas of the gas supply device passes through the second gas flow channel and then enters the second gap through the second communication holes, so that the support of the rotating shaft is realized through the gas. Between gaseous entering second clearance, can carry out the throttle to gaseous through the second intercommunication piece, and then prevent that air flow or velocity of flow are too big and produce the influence to the rotation process of pivot, ensure the stability and the reliability of pivot operation process.

In a specific application, the number of the second communication holes can be set according to actual needs. And the aperture of each second communicating hole is between 15 μm and 25 μm, specifically, the aperture of each second communicating hole can be 20 μm, and specifically, the aperture can be set according to actual needs.

According to a second aspect of the present invention, there is provided a centrifugal compressor comprising the bearing system as provided in the first aspect, thereby providing all the advantages of the bearing system, which will not be described herein.

In addition, the centrifugal compressor provided by the technical scheme of the invention also has the following additional technical characteristics:

in one possible design, the centrifugal compressor further comprises a housing, a gas supply device, a third gas flow channel, a fourth gas flow channel, a power supply device, a first impeller and a second impeller, wherein the shell is provided with a containing cavity, the bearing system is positioned in the containing cavity, the air supply device is arranged on the shell, and is positioned outside the containing cavity, a third airflow channel and a fourth airflow channel are respectively arranged in the shell in a penetrating way, the first end of the third airflow channel is communicated with the second end of the first airflow channel of the bearing system, the second end of the third airflow channel is communicated with the air supply device, the first end of the fourth airflow channel is communicated with the second end of the second airflow channel of the bearing system, the second end of the fourth airflow channel is communicated with the air supply device, the power supply device is arranged in the shell, and is electrically connected with the first magnetic suspension bearing and a second magnetic suspension bearing of the bearing system, and the first impeller and the second impeller are respectively arranged at two ends of the rotating shaft.

In this design, the centrifugal compressor is defined to further comprise a housing, a gas supply device, a third gas flow channel, a fourth gas flow channel, a power supply device, a first impeller and a second impeller, specifically, the housing has a containing cavity, the bearing system is located in the containing cavity, and the first magnetic suspension bearing and the second air suspension bearing of the bearing system are assembled on the housing, so that the fixed installation of the first bearing assembly and the second bearing assembly is realized.

The third airflow channel and the fourth airflow channel are arranged on the shell in a penetrating way, one end of the third airflow channel is communicated with the first airflow channel, and the other end of the third airflow channel is communicated with the air supply device. One end of the fourth airflow channel is communicated with the second airflow channel, and the other end of the fourth airflow channel is communicated with the air supply device, so that the air supply device can enable air to be introduced into the first gap and the second gap through the third airflow channel and the fourth airflow channel respectively, and the rotating shaft is supported through the air. And furthermore, in the working process of the centrifugal compressor, the first air bearing and the second air bearing can bear partial load, so that the structures of the first magnetic suspension bearing and the second magnetic suspension bearing can be correspondingly reduced, and the miniaturization of the centrifugal compressor is realized.

In addition, under the unusual circumstances such as inefficacy or outage appear in the magnetic suspension bearing, can regard as the protection bearing through first air bearing and second air bearing, and then under the unusual circumstances such as inefficacy or outage appear in the magnetic suspension bearing, when can effectively preventing to bump between pivot and the magnetic suspension bearing, support the pivot through gaseous, can also effectively avoid taking place dry friction and lead to the problem that protection bearing life reduces between pivot and the protection bearing under the unusual circumstances such as inefficacy or outage appear in the magnetic suspension bearing.

The power supply device is electrically connected with the first magnetic suspension bearing and the second magnetic suspension bearing of the bearing system, so that the first magnetic suspension bearing and the second magnetic suspension bearing generate electromagnetic force under the electrified condition, the rotating shaft is supported through the electromagnetic force, and the stability and the reliability of the rotating process of the rotating shaft are ensured.

First impeller and second impeller set up respectively at the both ends of pivot, at pivot pivoted in-process, can drive first impeller and second impeller and rotate, and then compress media such as refrigerant through centrifugal force, realize refrigeration plant's refrigeration effect.

According to a third aspect of the present invention, there is provided a refrigeration apparatus comprising the centrifugal compressor as provided in the second aspect, thereby providing all the advantages of the centrifugal compressor, which will not be described herein again.

According to a fourth aspect of the present invention, there is provided a control method of a centrifugal compressor, the control method of a centrifugal compressor comprising: introducing gas with a first flow rate into a first air bearing of the centrifugal compressor so as to support the rotating shaft through the gas; a first current is connected to a first magnetic suspension bearing of the centrifugal compressor so as to support the rotating shaft through the electromagnetic force of the first magnetic suspension bearing; the flow value of the first flow and the current value of the first current are in a preset proportion.

According to the control method of the centrifugal compressor provided by the embodiment of the invention, the gas supply device is controlled to introduce gas into the first air bearing, and the flow rate of the gas is the first flow rate. And the power supply device is controlled to access current to the first magnetic suspension bearing, the current is the first current value, and it can be understood that different supporting forces of the rotating shaft can be supported by controlling the first flow of the gas introduced by the gas supply device. And the first magnetic suspension bearing can generate electromagnetic forces with different sizes by controlling the current provided by the power supply device, so that the rotating shaft is supported by adopting different supporting forces. And the flow value of the first flow and the current value of the first current are in a preset proportion, so that the proportion of the first flow and the first current can be controlled to realize the load distribution of the first air bearing and the first magnetic suspension bearing, the first air bearing can bear a certain amount of load according to actual needs, the structure of the first magnetic suspension bearing is correspondingly reduced, and the miniaturization of the centrifugal compressor is realized.

In addition, the current value of the first current and the flow value of the first flow can be controlled according to the working requirement of the centrifugal compressor to realize different supporting effects on the rotating shaft, so that the stability and the reliability of the rotating process of the rotating shaft are ensured.

Furthermore, the vibration condition of the bearing system can be detected through the detection device, and then the current led into the first magnetic suspension bearing and/or the flow speed of the air flow led into the first gap can be adjusted according to the vibration condition of the bearing system, so that the rigidity and the damping of the bearing system are changed, and the stability and the reliability of the rotating process of the rotating shaft are further improved.

In specific application, when the first magnetic suspension bearing is judged to be in failure or power failure or other abnormal conditions, at the moment, the rotating shaft continues to rotate, and the supporting force of the first magnetic suspension bearing on the rotating shaft can be improved by increasing the flow value of the first flow. Or, when the vibration generated by the bearing system is judged to be larger, the supporting force of the first bearing assembly on the rotating shaft can be improved by increasing the current value of the first current and/or increasing the flow value of the first flow, so that the rotating process of the rotating shaft is more stable and reliable.

It is understood that a second flow of gas is provided to a second air bearing of the centrifugal compressor to support the shaft by the gas; a second current is connected to a second magnetic suspension bearing of the centrifugal compressor so as to support the rotating shaft through the electromagnetic force of the second magnetic suspension bearing; the flow value of the second flow and the current value of the second current are in a preset proportion. Therefore, the proportion of the second flow and the second current can be controlled to realize the load distribution of the second air bearing and the second magnetic suspension bearing, so that the second air bearing can bear a certain amount of load according to actual needs, the structure of the second magnetic suspension bearing is correspondingly reduced, and the miniaturization of the centrifugal compressor is realized.

In addition, the control method of the centrifugal compressor provided by the above technical solution of the present invention further has the following additional technical features:

in the above technical solution, further, the control method of the centrifugal compressor further includes detecting an amplitude of the bearing system; the first flow and/or the first current is adjusted in dependence on the amplitude of the bearing system.

In the technical scheme, the control method for the centrifugal compressor is limited to further comprise the step of detecting the vibration condition of the bearing system, so that the magnitude of the current led into the first magnetic suspension bearing and/or the flow speed of the airflow led into the first gap can be adjusted according to the vibration condition of the bearing system, the rigidity and the damping of the bearing system are changed, and the stability and the reliability of the rotating process of the rotating shaft are further improved.

It should be noted that the detection device may be a position sensor.

According to a fifth aspect of the present invention, there is provided a control device of a centrifugal compressor, comprising: the gas supply unit is used for introducing gas with a first flow rate to a first air bearing of the centrifugal compressor so as to support the rotating shaft through the gas; the power supply unit is used for connecting a first current to a first magnetic suspension bearing of the centrifugal compressor so as to support the rotating shaft through the electromagnetic force of the first magnetic suspension bearing; the flow value of the first flow and the current value of the first current are in a preset proportion.

The control device of the centrifugal compressor provided by the embodiment of the invention comprises an air supply unit and a power supply unit, and particularly, the air supply unit is controlled to introduce air into the first air bearing, and the flow rate of the air is a first flow rate. And the power supply unit is controlled to access current to the first magnetic suspension bearing, the current is a first current value, and it can be understood that different supporting forces of the rotating shaft can be supported by controlling the first flow of the gas introduced into the gas supply unit. And the first magnetic suspension bearing can generate electromagnetic forces with different sizes by controlling the current provided by the power supply unit, so that the rotating shaft is supported by adopting different supporting forces. And the flow value of the first flow and the current value of the first current are in a preset proportion, so that the proportion of the first flow and the first current can be controlled to realize the load distribution of the first air bearing and the first magnetic suspension bearing, the first air bearing can bear a certain amount of load according to actual needs, the structure of the first magnetic suspension bearing is correspondingly reduced, and the miniaturization of the centrifugal compressor is realized.

In addition, the control device for a centrifugal compressor according to the above aspect of the present invention further has the following additional features:

in the above technical solution, further, the control device of the centrifugal compressor further includes: a detection unit for detecting an amplitude of the bearing system; an adjusting unit for adjusting the first flow and/or the first current in dependence of the amplitude of the bearing system.

In the technical scheme, the control device of the centrifugal compressor further comprises a detection unit and an adjusting unit, specifically, the detection unit is used for detecting the vibration condition of the bearing system, and then the adjusting unit can adjust the magnitude of the current led into the first magnetic suspension bearing and/or the flow velocity of the air flow led into the first gap according to the vibration condition of the bearing system, so that the rigidity and the damping of the bearing system are changed, and the stability and the reliability of the rotating process of the rotating shaft are further improved.

It should be noted that the detection device may be a position sensor.

According to a sixth aspect of the present invention, there is provided a centrifugal compressor, comprising the control device of the centrifugal compressor according to the fifth aspect, so as to have all the beneficial technical effects of the control device of the centrifugal compressor, which will not be described herein again.

According to a seventh aspect of the present invention, there is provided a refrigeration apparatus comprising the centrifugal compressor as provided in the above sixth aspect, thereby providing all the advantages of the centrifugal compressor, which will not be described herein again.

According to an eighth aspect of the present invention, there is provided a computer-readable storage medium, on which a computer program is stored, wherein the computer program, when being executed by a processor, implements the control method of the centrifugal compressor according to the fourth aspect, thereby having all the advantages of the control method of the centrifugal compressor, and the details thereof are not repeated herein.

Additional aspects and advantages in accordance with the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 shows a schematic structural view of a centrifugal compressor according to an embodiment of the present invention;

FIG. 2 illustrates a partial schematic structural view of a centrifugal compressor according to one embodiment of the present invention;

FIG. 3 shows an enlarged view of the centrifugal compressor of the embodiment of FIG. 2 at A;

fig. 4 shows a partial structural schematic view of a centrifugal compressor according to another embodiment of the present invention;

fig. 5 shows one of the schematic flow charts of the control method of the centrifugal compressor according to one embodiment of the invention;

fig. 6 shows a second schematic flow chart of a control method of a centrifugal compressor according to an embodiment of the invention;

fig. 7 shows a block schematic of a control arrangement of a centrifugal compressor according to an embodiment of the invention.

Wherein, the correspondence between the reference numbers and the part names in fig. 1 to 7 is:

110 shaft, 120 first bearing assembly, 121 first air bearing, 1211 first communication member, 1212 first bearing body, 1213 first core, 1214 second core, 1215 thrust coil assembly, 122 first magnetic bearing, 130 first air flow passage, 131 first passage, 132 second passage, 140 second bearing assembly, 141 second air bearing, 1411 second communication member, 142 second magnetic bearing, 150 second air flow passage, 200 centrifugal compressor, 210 casing, 220 third air flow passage, 230 fourth air flow passage, 240 first impeller, 250 second impeller.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced otherwise than as specifically described herein, and thus the scope of the present invention is not limited by the specific embodiments disclosed below.

A bearing system, a centrifugal compressor 200, a refrigeration apparatus, a control method of a centrifugal compressor, a control device 700 of a centrifugal compressor, and a readable storage medium provided according to some embodiments of the present invention are described below with reference to fig. 1 to 7.

The first embodiment is as follows:

as shown in fig. 1, 2 and 3, an embodiment of the first aspect of the present invention provides a bearing system comprising: a rotating shaft 110; a first bearing assembly 120 sleeved on the rotating shaft 110; the first bearing assembly 120 includes: the first air bearing 121, the first air bearing 121 is provided with a first bearing surface, the first bearing surface is arranged towards the rotating shaft 110, and a first gap is formed between the first bearing surface and the outer surface of the rotating shaft 110; and the first magnetic suspension bearing 122, the first magnetic suspension bearing 122 and the first air suspension bearing 121 are arranged along the axial direction, and the first magnetic suspension bearing 122 is connected with the first air suspension bearing 121.

The bearing system provided by the embodiment of the invention comprises the rotating shaft 110 and the first bearing assembly 120, and particularly, the first bearing assembly 120 is sleeved on the rotating shaft 110, so that the support is provided for the rotating shaft 110 in the process of high-speed rotation of the rotating shaft 110, and the operation stability of the centrifugal compressor 200 with the bearing system is ensured.

The first bearing assembly 120 includes a first air bearing 121 and a first magnetic suspension bearing 122, specifically, the first air bearing 121 and the first magnetic suspension bearing 122 are arranged along the axial direction of the rotating shaft 110, and the first air bearing 121 is connected to the first magnetic suspension bearing 122, that is, the first air bearing 121 and the first magnetic suspension bearing 122 are integrated into one component, so that the number of parts on the rotating shaft 110 can be effectively reduced, and further the length of the cantilever end of the rotating shaft 110 is shortened, so that the critical speed and the isolation margin when the rotating shaft 110 rotates can be increased, and the rotating process of the rotating shaft 110 is more stable. In addition, during the operation of the centrifugal compressor 200, the first air bearing 121 can bear a part of the load, so that the structure of the first magnetic suspension bearing 122 can be reduced accordingly, and the centrifugal compressor 200 can be miniaturized.

Further, the first air bearing 121 includes a first bearing surface disposed toward the rotating shaft 110, that is, an inner surface of the first air bearing 121 facing the rotating shaft 110 is the first bearing surface. Specifically, a first gap is formed between the first bearing surface and the outer surface of the rotating shaft 110, and external air enters the first gap through a channel on the first air bearing 121, so that the rotating shaft 110 is supported by the air, and the stability of the rotating shaft 110 in the high-speed rotating process is ensured.

Moreover, when the magnetic suspension bearing is in failure or power failure or other abnormal conditions, the first air bearing 121 can be used as a protection bearing, so that when the magnetic suspension bearing is in failure or power failure or other abnormal conditions, the rotating shaft 110 can be effectively prevented from colliding with the magnetic suspension bearing, and simultaneously the rotating shaft 110 is supported by gas, and the problem that the service life of the protection bearing is shortened due to dry friction between the rotating shaft 110 and the protection bearing can be effectively avoided when the magnetic suspension bearing is in failure or power failure or other abnormal conditions.

In a specific application, the centrifugal compressor 200 further includes a power supply device and a gas supply device, specifically, the power supply device is configured to supply power to the first magnetic suspension bearing 122, the first magnetic suspension bearing 122 generates electromagnetic force when being powered on, so as to support the rotating shaft 110, it can be understood that the first magnetic suspension bearing 122 can generate electromagnetic force with different magnitude by controlling the current provided by the power supply device, so as to support the rotating shaft 110 with different support force.

The gas supply means is used to supply gas to the first gap, thereby supporting the rotary shaft 110 by the gas. It is understood that the supporting force of the rotating shaft 110 may be varied by controlling the flow rate of the gas supplied from the gas supply device.

Therefore, the load distribution of the first bearing assembly 120 to the shaft 110 can be realized by controlling the magnitude of the current flowing into the first magnetic suspension bearing 122 and/or the flow rate or flow velocity of the air flow flowing into the first gap, so that the first air bearing 121 can bear a certain amount of load according to the actual requirement, and further the structure of the first magnetic suspension bearing 122 is correspondingly reduced, and the centrifugal compressor 200 is miniaturized.

In addition, the centrifugal compressor 200 may further include a position sensor and a controller, which are used to detect the vibration condition of the bearing system and send the vibration condition to the controller, and the controller adjusts the magnitude of the current flowing into the first magnetic suspension bearing 122 and/or the flow rate of the air flow flowing into the first gap according to the vibration condition of the bearing system, so as to change the stiffness and damping of the bearing system, and further improve the stability and reliability of the rotation process of the rotating shaft 110.

It should be noted that, when it is determined that the first magnetic bearing 122 is in an abnormal condition such as failure or power failure, at this time, the rotating shaft 110 continues to rotate, and the supporting force of the first magnetic bearing 121 on the rotating shaft 110 can be improved by increasing the flow rate or flow velocity of the gas introduced into the first gap. Or, when it is determined that the vibration generated by the bearing system is large, the supporting force of the first bearing assembly 120 on the rotating shaft 110 may be increased by increasing the current value introduced into the first magnetic suspension bearing 122 and/or increasing the flow rate or flow velocity of the gas introduced into the first gap, so that the rotating process of the rotating shaft 110 is more stable and reliable.

In a specific application, the first magnetic bearing 122 is a radial magnetic bearing.

As shown in fig. 1, on the basis of the above embodiment, further, the bearing system further includes a first air flow channel 130, the first air flow channel 130 is disposed on the first bearing assembly 120, a first end of the first air flow channel 130 is communicated with the first gap, and a second end of the first air flow channel 130 is used for being communicated with the air supply device.

In this embodiment, the bearing system is further defined to include a first air flow passage 130, and specifically, the first air flow passage 130 is provided on the first bearing assembly 120, and one end of the first air flow passage 130 communicates with the first gap and the other end of the first air flow passage 130 communicates with the air supply device. Specifically, when the centrifugal compressor 200 operates, the rotating shaft 110 rotates, the gas supply device introduces gas into the first gap through the first gas flow channel 130, and then the rotating shaft 110 is supported by the gas flow, so that the first gas bearing 121 can bear a part of load, and then the structure of the first magnetic suspension bearing 122 can be correspondingly reduced, thereby realizing the miniaturization of the centrifugal compressor 200.

In addition, when the magnetic suspension bearing is in failure or power failure or other abnormal conditions, the first air bearing 121 can be used as a protection bearing, so that when the magnetic suspension bearing is in failure or power failure or other abnormal conditions, the rotating shaft 110 can be effectively prevented from colliding with the magnetic suspension bearing, and simultaneously the rotating shaft 110 is supported through gas, and the problem that the service life of the protection bearing is shortened due to dry friction between the rotating shaft 110 and the protection bearing can be effectively avoided when the magnetic suspension bearing is in failure or power failure or other abnormal conditions.

As shown in fig. 1, fig. 2 and fig. 3, on the basis of the above embodiment, further, the first air flow channel 130 includes a first channel 131 and a second channel 132, wherein the first channel 131 is disposed on the first air bearing 121, a first end of the first channel 131 is communicated with the first gap, the second channel 132 is disposed on the first magnetic bearing 122, a first end of the second channel 132 is communicated with a second end of the first channel 131, and a second end of the second channel 132 is used for being communicated with the air supply device.

In this embodiment, the first air flow passage 130 is defined to include a first passage 131 and a second passage 132, and specifically, the first passage 131 is provided on the first air bearing 121, and one end of the first passage 131 communicates with the first gap. The second passage 132 is provided on the first magnetic bearing 122, one end of the second passage 132 communicates with the other end of the first passage 131, and the other end of the second passage 132 communicates with the gas supply device. So that the gas supply means can supply gas to the first gap through the second channel 132 and the first channel 131, thereby supporting the rotary shaft 110 by the gas. Therefore, the first air bearing 121 can bear part of the load, and the structure of the first magnetic suspension bearing 122 can be correspondingly reduced, thereby realizing the miniaturization of the centrifugal compressor 200.

As shown in fig. 1, 2 and 3, on the basis of the above embodiment, further, the first air bearing 121 includes a first communicating member 1211, the first communicating member 1211 is provided with a plurality of first communicating holes, and the first end of the first air flow channel 130 communicates with the first gap through the plurality of first communicating holes.

In this embodiment, it is defined that the first air bearing 121 includes a first communicating member 1211, and specifically, the first communicating member 1211 is provided with a plurality of first communicating holes, which are arranged at intervals on the first communicating member 1211. After passing through the second channel 132 and the first channel 131, the gas of the gas supply device enters the first gap through the plurality of first communication holes, and then the support of the rotating shaft 110 is realized through the gas. Between the gas entering the first gap, the gas can be throttled by the first communicating member 1211, so that the influence of the excessive flow rate or flow velocity of the gas on the rotation process of the rotating shaft 110 is prevented, and the stability and reliability of the operation process of the rotating shaft 110 are ensured.

As shown in fig. 3, in an exemplary embodiment, the first air bearing 121 further includes a first bearing body 1212, a first core 1213, a second core 1214 and a thrust coil assembly 1215, wherein the first core 1213 and the second core 1214 are disposed on the first bearing body 1212, the thrust coil assembly 1215 is disposed on the first bearing body 1212, and the first communicating member 1211 is disposed on the thrust coil assembly 1215.

In this embodiment, the first air bearing 121 is further defined to include a first bearing body 1212, a first core 1213, a second core 1214, and a thrust coil assembly 1215, and specifically, the first core 1213 and the second core 1214 are disposed on the first bearing body 1212, the thrust coil assembly 1215 is disposed on the first bearing body 1212, and a first communication member 1211 is disposed on the thrust coil assembly 1215, and when the thrust coil assembly 1215 is energized, an electromagnetic force is generated by the combined action of the first core 1213, the second core 1214, and the thrust coil assembly 1215, and the shaft 110 is supported by the portion of the electromagnetic force and the electromagnetic force generated by the first magnetic suspension bearing 122.

Example two:

as shown in fig. 1 and 4, on the basis of the above embodiment, further, the bearing system further includes a second bearing assembly 140, the second bearing assembly 140 is sleeved on the rotating shaft 110, and the second bearing assembly 140 is spaced apart from the first bearing assembly 120.

In this embodiment, the bearing system is further defined to include a second bearing assembly 140, specifically, the second bearing assembly 140 is sleeved on the rotating shaft 110, and the second bearing assembly 140 is spaced from the first bearing assembly 120, so that the supporting force of the rotating shaft 110 is balanced while the rotating shaft 110 is effectively supported, and the stability and reliability of the rotating process of the rotating shaft 110 are further improved.

In a specific application, the first bearing assembly 120 and the second bearing assembly 140 are respectively disposed near both ends of the rotating shaft 110, so as to ensure the balance of the supporting force for the rotating shaft 110, and further improve the stability and reliability of the rotating process of the rotating shaft 110. Thereby improving the operational stability and reliability of the centrifugal compressor 200 having the bearing system.

As shown in fig. 1 and 4, based on the above embodiment, further, the second bearing assembly 140 includes a second air bearing 141 and a second magnetic suspension bearing 142, wherein the second air bearing 141 is provided with a second bearing surface, the second bearing surface is disposed toward the rotating shaft 110, a second gap is formed between the second bearing surface and the outer surface of the rotating shaft 110, the second magnetic suspension bearing 142 and the second air bearing 141 are axially arranged, and the second magnetic suspension bearing 142 is connected to the second air bearing 141.

In this embodiment, the second bearing assembly 140 includes a second air bearing 141 and a second magnetic suspension bearing 142, and specifically, the second air bearing 141 and the second magnetic suspension bearing 142 are arranged along the axial direction of the rotating shaft 110, and the second air bearing 141 is connected to the second magnetic suspension bearing 142, that is, the second air bearing 141 and the second magnetic suspension bearing 142 are integrated into one component, so that the number of parts on the rotating shaft 110 can be further reduced, the length of the cantilever end of the rotating shaft 110 can be further shortened, the critical speed and the isolation margin during the rotation of the rotating shaft 110 can be increased, and the rotation process of the rotating shaft 110 can be more stable. In addition, during the operation of the centrifugal compressor 200, the second air bearing 141 can bear a part of the load, so that the structure of the second magnetic bearing 142 can be correspondingly reduced, and the centrifugal compressor 200 can be further miniaturized.

Further, the second air bearing 141 includes a second bearing surface, and the second bearing surface is disposed toward the rotating shaft 110, that is, an inner surface of the second air bearing 141 facing the rotating shaft 110 is the second bearing surface. Specifically, a second gap is formed between the second bearing surface and the outer surface of the rotating shaft 110, and external air enters the second gap through a channel on the second air bearing 141, so that the rotating shaft 110 is supported by the air, and the stability of the rotating shaft 110 in the high-speed rotating process is ensured.

Moreover, when the magnetic suspension bearing is in failure or power failure or other abnormal conditions, the second air bearing 141 can be used as a protection bearing, so that the second air bearing 141 and the first air bearing 121 jointly support the rotating shaft 110, and further, when the magnetic suspension bearing is in failure or power failure or other abnormal conditions, the rotating shaft 110 can be effectively supported through gas while collision between the rotating shaft 110 and the magnetic suspension bearing can be effectively prevented, and the problem that the service life of the protection bearing is reduced due to dry friction between the rotating shaft 110 and the protection bearing can be effectively avoided under the condition that the magnetic suspension bearing is in failure or power failure or other abnormal conditions.

In a specific application, the power supply device is configured to supply power to the second magnetic suspension bearing 142, and the second magnetic suspension bearing 142 generates electromagnetic force when being powered on, so as to support the rotating shaft 110. The gas supply means is used to supply gas to the second gap, thereby supporting the rotation shaft 110 by the gas. It is understood that the supporting force of the rotating shaft 110 may be varied by controlling the flow rate of the gas supplied from the gas supply device. Therefore, the load distribution of the second bearing assembly 140 to the shaft 110 can be realized by controlling the magnitude of the current flowing into the second magnetic suspension bearing 142 and/or the flow rate or flow velocity of the air flow flowing into the second gap, so that the second air bearing 141 can bear a certain amount of load according to the actual requirement, and further the structure of the second magnetic suspension bearing 142 is correspondingly reduced, and the centrifugal compressor 200 is miniaturized.

In addition, the controller may also adjust the magnitude of the current flowing into the second magnetic bearing 142 and/or the flow rate or velocity of the air flow flowing into the second gap according to the vibration condition of the bearing system, so as to change the stiffness and damping of the bearing system, thereby improving the stability and reliability of the rotation process of the rotating shaft 110.

It should be noted that, when it is determined that the second magnetic suspension bearing 142 is in an abnormal condition such as failure or power failure, the rotating shaft 110 continues to rotate, and the supporting force of the second air bearing 141 on the rotating shaft 110 can be improved by increasing the flow rate or flow velocity of the gas introduced into the second gap. Or, when it is determined that the vibration generated by the bearing system is large, the supporting force of the second bearing assembly 140 on the rotating shaft 110 may be improved by increasing the current value introduced into the second magnetic bearing 142 and/or increasing the flow rate or flow velocity of the gas introduced into the second gap, so that the rotating process of the rotating shaft 110 is more stable and reliable.

In a specific application, the second magnetic bearing 142 is a radial magnetic bearing.

As shown in fig. 1 and fig. 4, on the basis of the above embodiment, further, the bearing system further includes a second air flow channel 150, the second air flow channel 150 is disposed on the second air bearing 141, a first end of the second air flow channel 150 is communicated with the second gap, and a second end of the second air flow channel 150 is used for being communicated with the air supply device.

In this embodiment, the bearing system is further defined to include a second air flow channel 150, specifically, the second air flow channel 150 is disposed on the second air bearing 141, and one end of the second air flow channel 150 is communicated with the second gap, and the other end of the second air flow channel 150 is communicated with the air supply device. Specifically, when the centrifugal compressor 200 operates, the rotating shaft 110 rotates, the air supply device supplies air to the second gap through the second air flow channel 150, and the other end of the rotating shaft 110 is supported by the air flow, so that the second air bearing 141 can bear a part of the load, the structure of the second magnetic bearing 142 can be correspondingly reduced, and the centrifugal compressor 200 is miniaturized.

In addition, when the magnetic suspension bearing is in failure or power failure or other abnormal conditions, the second air bearing 141 can be used as a protection bearing, so that when the magnetic suspension bearing is in failure or power failure or other abnormal conditions, the rotating shaft 110 can be effectively prevented from colliding with the magnetic suspension bearing, and simultaneously the rotating shaft 110 is supported through gas, and the problem that the service life of the protection bearing is shortened due to dry friction between the rotating shaft 110 and the protection bearing can be effectively avoided when the magnetic suspension bearing is in failure or power failure or other abnormal conditions.

As shown in fig. 1 and 4, on the basis of the above-described embodiment, further, the second air bearing 141 includes a second communication piece 1411, the second communication piece 1411 is provided with a plurality of second communication holes, and the first end of the second air flow passage 150 communicates with the second gap through the plurality of second communication holes.

In this embodiment, the second air bearing 141 is defined to include a second communication member 1411, and specifically, the second communication member 1411 is provided with a plurality of second communication holes that are arranged at intervals on the second communication member 1411. After passing through the second air flow channel 150, the gas of the gas supply device enters the second gap through the second communication holes, and then the support of the rotating shaft 110 is realized through the gas. Between the gas enters the second gap, the gas can be throttled through the second communicating part 1411, so that the influence on the rotation process of the rotating shaft 110 caused by the overlarge flow rate or flow velocity of the gas is prevented, and the stability and the reliability of the operation process of the rotating shaft 110 are ensured.

Example three:

according to a second aspect of the present invention, there is provided a centrifugal compressor 200 comprising the bearing system as provided in the first aspect, thereby providing all the advantages of the bearing system, which will not be described herein.

As shown in fig. 1, on the basis of the above embodiment, further, the centrifugal compressor 200 further includes a housing 210, a gas supply device, a third gas flow channel 220, a fourth gas flow channel 230, a power supply device, a first impeller 240 and a second impeller 250, wherein the housing 210 has a receiving cavity, the bearing system is located in the receiving cavity, the gas supply device is disposed in the housing 210 and located outside the receiving cavity, the third gas flow channel 220 and the fourth gas flow channel 230 are respectively disposed in the housing 210 in a penetrating manner, a first end of the third gas flow channel 220 is communicated with a second end of the first gas flow channel 130 of the bearing system, a second end of the third gas flow channel 220 is communicated with the gas supply device, a first end of the fourth gas flow channel 230 is communicated with a second end of the second gas flow channel 150 of the bearing system, a second end of the fourth gas flow channel 230 is communicated with the gas supply device, the power supply device is disposed in the housing 210 and electrically connected with the first magnetic suspension bearing 122 and the second magnetic suspension bearing 142 of the bearing system, the first impeller 240 and the second impeller 250 are respectively disposed at both ends of the rotating shaft 110.

In this embodiment, the centrifugal compressor 200 is further defined to include a housing 210, an air supply device, a third air flow passage 220, a fourth air flow passage 230, an electric supply device, a first impeller 240 and a second impeller 250, specifically, the housing 210 has a receiving cavity in which the bearing system is located, and the first magnetic suspension bearing 122 and the second air suspension bearing 141 of the bearing system are fitted on the housing 210, thereby achieving the fixed mounting of the first bearing assembly 120 and the second bearing assembly 140.

The third air flow channel 220 and the fourth air flow channel 230 are opened on the housing 210 in a penetrating manner, one end of the third air flow channel 220 is communicated with the first air flow channel 130, and the other end of the third air flow channel 220 is communicated with the air supply device. One end of the fourth air flow channel 230 is communicated with the second air flow channel 150, and the other end of the fourth air flow channel 230 is communicated with the air supply device, so that the air supply device can introduce air into the first gap and the second gap through the third air flow channel 220 and the fourth air flow channel 230, respectively, and further support the rotating shaft 110 through the air. Further, during the operation of the centrifugal compressor 200, the first air bearing 121 and the second air bearing 141 can bear a part of the load, and thus the structures of the first magnetic suspension bearing 122 and the second magnetic suspension bearing 142 can be reduced accordingly, thereby realizing the miniaturization of the centrifugal compressor 200.

In addition, when the magnetic suspension bearing is in failure or power failure or other abnormal conditions, the first air bearing 121 and the second air bearing 141 can be used as protection bearings, and then when the magnetic suspension bearing is in failure or power failure or other abnormal conditions, the rotating shaft 110 can be effectively supported through gas while collision between the rotating shaft 110 and the magnetic suspension bearing can be effectively prevented, and the problem that the service life of the protection bearing is reduced due to dry friction between the rotating shaft 110 and the protection bearing can be effectively avoided under the magnetic suspension bearing is in failure or power failure or other abnormal conditions.

The power supply device is electrically connected to the first magnetic suspension bearing 122 and the second magnetic suspension bearing 142 of the bearing system, so that the first magnetic suspension bearing 122 and the second magnetic suspension bearing 142 generate electromagnetic force when being powered on, and further support the rotating shaft 110 through the electromagnetic force, thereby ensuring the stability and reliability of the rotating process of the rotating shaft 110.

The first impeller 240 and the second impeller 250 are respectively arranged at two ends of the rotating shaft 110, and in the rotating process of the rotating shaft 110, the first impeller 240 and the second impeller 250 can be driven to rotate, so that media such as a refrigerant are compressed through centrifugal force, and the refrigerating effect of the refrigerating device is realized.

Example four:

Example five:

as shown in fig. 5, according to a fourth aspect of the present invention, there is provided a control method of a centrifugal compressor, the control method of a centrifugal compressor comprising:

102, introducing a first flow of gas into a first gas bearing of the centrifugal compressor so as to support the rotating shaft through the gas;

104, connecting a first current to a first magnetic suspension bearing of the centrifugal compressor so as to support the rotating shaft through the electromagnetic force of the first magnetic suspension bearing;

the flow value of the first flow and the current value of the first current are in a preset proportion.

Example six:

as shown in fig. 6, according to an embodiment of the present invention, there is provided a control method of a centrifugal compressor including:

step 202, introducing a first flow of gas into a first gas bearing of the centrifugal compressor so as to support the rotating shaft through the gas;

step 204, a first current is connected to a first magnetic suspension bearing of the centrifugal compressor so as to support the rotating shaft through the electromagnetic force of the first magnetic suspension bearing;

step 206, detecting the amplitude of the bearing system;

the first flow and/or the first current is adjusted 208 based on the amplitude of the bearing system.

In this embodiment, the control method for the centrifugal compressor is further defined to detect a vibration condition of the bearing system, and then the magnitude of the current flowing into the first magnetic suspension bearing and/or the flow rate or the flow velocity of the air flow flowing into the first gap can be adjusted according to the vibration condition of the bearing system, so that the rigidity and the damping of the bearing system are changed, and the stability and the reliability of the rotation process of the rotating shaft are further improved.

It should be noted that the detection device may be a position sensor.

Example seven:

as shown in fig. 7, according to a fifth aspect of the present invention, there is provided a control apparatus 700 of a centrifugal compressor, the control apparatus of a centrifugal compressor comprising: the gas supply unit 701 is used for introducing gas with a first flow rate into a first air bearing of the centrifugal compressor so as to support the rotating shaft through the gas; a power supply unit 702 for supplying a first current to a first magnetic bearing of the centrifugal compressor to support the rotating shaft by an electromagnetic force of the first magnetic bearing; the flow value of the first flow and the current value of the first current are in a preset proportion.

The control device 700 of the centrifugal compressor according to the embodiment of the present invention includes an air supply unit 701 and a power supply unit 702, and specifically, controls the air supply unit 701 to introduce air into the first air bearing, where the flow rate of the air is a first flow rate. And the power supply unit 702 is controlled to supply current to the first magnetic suspension bearing, and the current is a first current value, it can be understood that different supporting forces of the rotating shaft can be supported by controlling the first flow of the gas supplied to the gas supply unit. And the first magnetic suspension bearing can generate electromagnetic forces with different sizes by controlling the current provided by the power supply unit, so that the rotating shaft is supported by adopting different supporting forces. And the flow value of the first flow and the current value of the first current are in a preset proportion, so that the proportion of the first flow and the first current can be controlled to realize the load distribution of the first air bearing and the first magnetic suspension bearing, the first air bearing can bear a certain amount of load according to actual needs, the structure of the first magnetic suspension bearing is correspondingly reduced, and the miniaturization of the centrifugal compressor is realized.

On the basis of the above embodiment, further, the control device 700 of the centrifugal compressor further includes: a detection unit for detecting an amplitude of the bearing system; an adjusting unit for adjusting the first flow and/or the first current in dependence of the amplitude of the bearing system.

In this embodiment, the control device 700 of the centrifugal compressor further includes a detecting unit and an adjusting unit, specifically, the detecting unit is configured to detect a vibration condition of the bearing system, and the adjusting unit can adjust a magnitude of the current flowing into the first magnetic suspension bearing and/or a flow rate or a flow velocity of the air flow flowing into the first gap according to the vibration condition of the bearing system, so as to change a stiffness and a damping of the bearing system, and further improve stability and reliability of the rotation process of the rotating shaft.

It should be noted that the detection device may be a position sensor.

Example eight:

Example nine:

Example ten:

In the description of the present specification, the terms "connect", "mount", "fix", and the like are to be understood in a broad sense, for example, "connect" may be a fixed connection, a detachable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A bearing system, comprising:

a rotating shaft;

the first bearing assembly is sleeved on the rotating shaft;

the first bearing assembly includes:

the first air bearing is provided with a first bearing surface, the first bearing surface faces the rotating shaft, and a first gap is formed between the first bearing surface and the outer surface of the rotating shaft;

the first magnetic suspension bearing and the first air bearing are axially arranged, and the first magnetic suspension bearing is connected with the first air bearing.

2. The bearing system of claim 1, further comprising:

and the first end of the first air flow channel is communicated with the first gap, and the second end of the first air flow channel is used for being communicated with an air supply device.

3. The bearing system of claim 2 wherein the first air flow passage comprises:

the first channel is arranged on the first air bearing, and a first end of the first channel is communicated with the first gap;

and the second channel is arranged on the first magnetic suspension bearing, the first end of the second channel is communicated with the second end of the first channel, and the second end of the second channel is communicated with an air supply device.

4. The bearing system of claim 2, wherein the first gas bearing comprises:

the first communicating piece is provided with a plurality of first communicating holes, and the first end of the first air flow channel is communicated with the first gap through the first communicating holes.

5. The bearing system of claim 4, wherein the first air bearing further comprises:

a first bearing body;

the first iron core and the second iron core are arranged on the first bearing body;

the thrust coil assembly is arranged on the first bearing body, and the first communicating piece is arranged on the thrust coil assembly.

6. The bearing system of any one of claims 1 to 5, further comprising:

and the second bearing assembly is sleeved on the rotating shaft and is arranged at an interval with the first bearing assembly.

7. A centrifugal compressor, comprising: a bearing system according to any one of claims 1 to 6.

8. The centrifugal compressor of claim 7, further comprising:

a housing having a receiving cavity, the bearing system being located within the receiving cavity;

the air supply device is arranged on the shell and is positioned outside the accommodating cavity;

a third airflow channel and a fourth airflow channel which are respectively arranged in the shell in a penetrating way, wherein the first end of the third airflow channel is communicated with the second end of the first airflow channel of the bearing system, the second end of the third airflow channel is communicated with the air supply device, the first end of the fourth airflow channel is communicated with the second end of the second airflow channel of the bearing system, and the second end of the fourth airflow channel is communicated with the air supply device;

the power supply device is arranged on the shell and is electrically connected with the first magnetic suspension bearing and the second magnetic suspension bearing of the bearing system;

and the first impeller and the second impeller are respectively arranged at two ends of the rotating shaft.

9. Refrigeration device, characterized in that it comprises a centrifugal compressor according to claim 7 or 8.

10. A control method of a centrifugal compressor, characterized by comprising:

introducing a first flow of gas into a first gas bearing of the centrifugal compressor so as to support the rotating shaft through the gas;

a first current is connected to a first magnetic suspension bearing of the centrifugal compressor so as to support the rotating shaft through the electromagnetic force of the first magnetic suspension bearing;

the flow value of the first flow is in a preset proportion to the current value of the first current.

11. The control method of a centrifugal compressor according to claim 10, further comprising:

detecting an amplitude of the bearing system;

adjusting the first flow and/or the first current according to an amplitude of the bearing system.

12. A control device of a centrifugal compressor, characterized by comprising:

the gas supply unit is used for introducing gas with a first flow rate to a first air bearing of the centrifugal compressor so as to support the rotating shaft through the gas;

the power supply unit is used for accessing a first current to a first magnetic suspension bearing of the centrifugal compressor so as to support the rotating shaft through the electromagnetic force of the first magnetic suspension bearing;

13. A centrifugal compressor, characterized by comprising a control device of a centrifugal compressor according to claim 12.

14. A refrigeration apparatus comprising a centrifugal compressor as claimed in claim 13.

15. A readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, performs the steps of the control method of a centrifugal compressor according to claim 10 or 11.