CN114251359A

CN114251359A - Compressor and refrigerating system

Info

Publication number: CN114251359A
Application number: CN202111399390.0A
Authority: CN
Inventors: 张晓锐; 张捷; 王书森; 邓善营; 顾超
Original assignee: Qingdao Haier Air Conditioner Gen Corp Ltd; Qingdao Haier Air Conditioning Electric Co Ltd; Haier Smart Home Co Ltd
Current assignee: Qingdao Haier Air Conditioner Gen Corp Ltd; Qingdao Haier Air Conditioning Electric Co Ltd; Haier Smart Home Co Ltd
Priority date: 2021-11-19
Filing date: 2021-11-19
Publication date: 2022-03-29
Also published as: WO2023087730A1

Abstract

The application relates to the technical field of refrigeration, discloses a compressor, includes: a rotor; the support assembly comprises two air-floatation radial bearings; the two air-floatation radial bearings are respectively sleeved at two ends of the rotor to support the rotor; an adjustment assembly comprising a radial adjustment portion comprising two magnetically levitated radial bearings; the two magnetic levitation radial bearings are respectively sleeved at two ends of the rotor, and electromagnetic supporting force is adjusted according to radial offset of corresponding ends of the rotor so as to balance the rotor. When the rotor is deflected radially, the magnetic suspension radial bearings at the two ends of the rotor are started. And the two magnetic levitation radial bearings respectively adjust the electromagnetic supporting force of the two magnetic levitation radial bearings according to the radial offset of the corresponding ends of the rotor, so that the radial offset of the rotor is quickly balanced. The embodiment of the disclosure also provides a refrigerating system.

Description

Compressor and refrigerating system

Technical Field

The present application relates to the field of compressor technology, and for example, to a compressor and a refrigeration system.

Background

The centrifugal compressor is a key component in the field of air-conditioning refrigeration, and the bearings of the compressor comprise an oil lubricating bearing and a suspension bearing, and the suspension bearing comprises a magnetic suspension bearing and an air suspension bearing. The compressor adopting the air suspension bearing does not need lubricating oil to lubricate the bearing, so that the phenomenon that the heat exchange efficiency of the air conditioning system is reduced due to the mixing of the lubricating oil and the refrigerant is avoided. And the air bearing has no friction loss, can operate with ultralow noise and has great application prospect in the field of air-conditioning refrigeration. However, the axial offset or radial offset of the rotor inevitably occurs by adopting the air bearing, and once the offset is too large, the rotor and the bearing are abraded, the bearing and the rotor are damaged, and the service life of the compressor is influenced.

The prior art discloses a compressor, which uses two non-magnetic bearing as radial bearings to support the rotor, and in order to balance the axial force of the rotor, a thrust disc and a magnetic bearing are arranged at one end of the rotor far from the compressor impeller. When the rotor is subjected to an axial force, the magnetic suspension axial bearing is started, and the axial force is counteracted through the magnetic acting force between the magnetic suspension axial bearing and the thrust disc.

In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art: for a radial bearing system that uses an air bearing as a support rotor, the rotor is prone to vibration and radial deflection in the radial direction. The above-mentioned related art improves the axial deflection of the rotor only by means of the magnetically levitated axial bearing, the radial deflection being not adjusted.

Disclosure of Invention

The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview nor is intended to identify key/critical elements or to delineate the scope of such embodiments but rather as a prelude to the more detailed description that is presented later.

The embodiment of the disclosure provides a compressor and a refrigerating system, and solves the problem of how to adjust radial offset of a rotor

In some embodiments, the compressor comprises:

a rotor;

the support assembly comprises two air-floatation radial bearings; the two air-floatation radial bearings are respectively sleeved at two ends of the rotor to support the rotor;

an adjustment assembly comprising a radial adjustment portion comprising two magnetically levitated radial bearings; the two magnetic levitation radial bearings are respectively sleeved at two ends of the rotor, and electromagnetic supporting force is adjusted according to radial offset of corresponding ends of the rotor so as to balance the rotor.

Optionally, the two magnetic levitation radial bearings are respectively located on one side of one air floatation radial bearing away from the other air floatation radial bearing.

Optionally, the radial adjustment portion further comprises:

radial monitoring means for monitoring said radial offset;

and the first controller is electrically connected with the radial monitoring device and the magnetic levitation radial bearing and used for adjusting the electromagnetic supporting force of the magnetic levitation radial bearing according to the radial offset.

Optionally, the first controller processes the radial offset by a least mean square algorithm and obtains a following signal, and controls the electromagnetic supporting force by the following signal.

Optionally, the adjustment assembly further comprises:

an axial adjustment portion to balance the rotor according to an axial offset of the rotor.

Optionally, a thrust disc is arranged on a shaft body of the rotor, and the thrust disc is located between the two air-floatation radial bearings;

the axial adjustment portion includes:

and the two thrust bearings are sleeved on the rotor and are respectively close to two sides of the thrust disc.

Optionally, the thrust bearing is an air-floating axial bearing;

the axial adjustment portion further includes:

axial monitoring means for monitoring said axial offset;

and the second controller is used for adjusting the air supply amount to the air-floatation axial bearing according to the axial offset, so that the pressure of the air-floatation axial bearing is adjusted.

Optionally, the compressor further comprises:

a motor cavity;

and the air return port is communicated with the air floatation axial bearing and is used for supplying the cooling medium in the motor cavity to the air floatation axial bearing.

Optionally, the thrust bearing is a magnetic levitation axial bearing.

In some embodiments, the refrigeration system comprises a compressor as described in any of the embodiments above.

The compressor and the refrigerating system provided by the embodiment of the disclosure can realize the following technical effects:

when the rotor is deflected radially, the magnetic suspension radial bearings at the two ends of the rotor are started. And the two magnetic levitation radial bearings respectively adjust the electromagnetic supporting force of the two magnetic levitation radial bearings according to the radial offset of the corresponding ends of the rotor, so that the radial offset of the rotor is quickly balanced.

The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.

Drawings

One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:

fig. 1 is a schematic structural diagram of a compressor provided in an embodiment of the present disclosure;

FIG. 2 is an enlarged view of portion A of FIG. 1;

FIG. 3 is an enlarged view of portion B of FIG. 1;

FIG. 4 is a schematic structural view of a shaft end cap provided by an embodiment of the present disclosure;

FIG. 5 is a schematic diagram of an auxiliary airway structure provided by an embodiment of the present disclosure;

fig. 6 is a schematic structural diagram of another compressor provided in the embodiment of the present disclosure.

Reference numerals:

100: a compressor; 110: a rotor; 111: a thrust disc; 120: a stator; 130: a motor cavity; 131: a cooling inlet; 132: an air return port;

200: a magnetic levitation radial bearing; 201: an upward bias sensor; 202: a downward deviation sensor;

300: an air-floating axial bearing; 301: a forward bias sensor; 302: a back-bias sensor; 303: a first gas supply passage;

400: an air-floating radial bearing; 401: a second gas supply passage; 431: a bearing support; 432: a shaft end cover; 433: an auxiliary airway;

500: magnetic suspension axial bearing.

Detailed Description

So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.

The terms "first," "second," and the like in the description and in the claims, and the above-described drawings of embodiments of the present disclosure, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the present disclosure described herein may be made. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.

In the embodiments of the present disclosure, the terms "upper", "lower", "inner", "middle", "outer", "front", "rear", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the disclosed embodiments and their examples and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation. Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meanings of these terms in the embodiments of the present disclosure can be understood by those of ordinary skill in the art as appropriate.

In addition, the terms "disposed," "connected," and "secured" are to be construed broadly. For example, "connected" may be a fixed connection, a detachable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. Specific meanings of the above terms in the embodiments of the present disclosure can be understood by those of ordinary skill in the art according to specific situations.

The term "plurality" means two or more unless otherwise specified.

In the embodiment of the present disclosure, the character "/" indicates that the preceding and following objects are in an or relationship. For example, A/B represents: a or B.

The term "and/or" is an associative relationship that describes objects, meaning that three relationships may exist. For example, a and/or B, represents: a or B, or A and B.

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

The compressor 100 is used as a key component in a refrigeration system, lubricating oil is not needed to be adopted for lubrication under the condition that a support component of a bearing-rotor system adopts an air suspension bearing, the lubricating oil is prevented from being mixed with a refrigerant in an air conditioning system, and the lubricating oil is prevented from being deposited on the wall of a heat exchange tube of an evaporator or a condenser to influence the heat exchange efficiency. In order to ensure stable operation of the compressor 100, an external air supply device is required to continuously and stably supply air to the air bearing. Meanwhile, the rotor 110 may have axial movement and radial offset due to unstable air supply or external force, which may cause unbalance of the bearing-rotor system and seriously affect the service life of the compressor 100.

In some embodiments, the support assembly includes two air bearing journal bearings 400. The compressor 100 is provided with a stator 120, and the air-floatation radial bearing 400 located in front of the stator 120 is called a front air-floatation radial bearing, and the air-floatation radial bearing 400 located behind the stator 120 is called a rear air-floatation radial bearing. The end of the rotor 110 located forward of the stator 120 is referred to as the rotor front end, and the end of the rotor 110 located rearward of the stator 120 is referred to as the rotor rear end. The front air-float radial bearing is sleeved at the front end of the rotor and used for supporting and lubricating the front end of the rotor; the rear air-float radial bearing is sleeved at the rear end of the rotor and used for supporting and lubricating the rear end of the rotor.

Optionally, the support assembly further comprises a bearing mount 431 for mounting the air journal bearing 400. The bearing mount 431 includes a front bearing mount for mounting a front radial air bearing and a rear bearing mount for mounting a rear radial air bearing. Moreover, the front bearing support and the rear bearing support are respectively provided with a first air supply passage 303 for respectively supplying air to the front radial air bearing and the rear radial air bearing.

As shown in connection with fig. 1-6, embodiments of the present disclosure provide a compressor 100 including a rotor 110, a support assembly, and a conditioning assembly. Wherein the adjustment assembly comprises a radial adjustment portion comprising two magnetically levitated radial bearings 200; the two magnetic levitation radial bearings 200 are respectively sleeved at two ends of the rotor 110, and adjust the electromagnetic supporting force according to the radial offset of the corresponding end of the rotor 110, so as to balance the rotor 110.

With the compressor 100 provided by the embodiment of the present disclosure, when the rotor 110 is radially offset, the magnetic levitation radial bearings 200 at both ends of the rotor 110 are started. And the two magnetic levitation radial bearings 200 respectively adjust the electromagnetic supporting force thereof according to the radial offset of the corresponding end of the rotor 110, thereby rapidly balancing the radial offset of the rotor 110.

Alternatively, bounded by the stator 120 of the compressor 100, the magnetic-levitation radial bearing 200 located in front of the stator 120 is referred to as a front magnetic-levitation radial bearing, and the magnetic-levitation radial bearing 200 located behind the stator 120 is referred to as a rear magnetic-levitation radial bearing. The front magnetic levitation radial bearing is positioned on one side of the front air floatation radial bearing, which is far away from the rear air floatation radial bearing, and the rear magnetic levitation radial bearing is positioned on one side of the rear air floatation radial bearing, which is far away from the front air floatation radial bearing. In the case of the rotor 110 being radially offset, the amount of radial offset is the greatest at both ends of the rotor 110. Thus, the above arrangement is advantageous for rapidly balancing the radial offset of the rotor 110.

Alternatively, the magnetically levitated radial bearing 200 includes a plurality of independently controlled electromagnetic coils, such as four electromagnetic coils. The four electromagnetic coils are an upper coil, a lower coil, a left coil, and a right coil, respectively, and are located at an upper side, a lower side, a left side, and a right side of the rotor 110, respectively, and generate an electromagnetic supporting force when the electromagnetic coils are energized and the larger the current is, the larger the electromagnetic supporting force is.

Optionally, the radial adjustment portion further comprises a radial monitoring device and a first controller. The radial monitoring device is used for monitoring radial offset; the first controller is electrically connected to the radial monitoring device and the magnetic-levitation radial bearing 200 for adjusting the electromagnetic supporting force of the magnetic-levitation radial bearing 200 according to the radial offset.

Further, optionally, the radial offset directions of the rotor 110 include an upper deflection, a lower deflection, a left deflection and a right deflection, and the positions of the upper coil, the lower coil, the left coil and the right coil of the magnetic levitation radial bearing 200 correspond to four radial offset directions, respectively. The radial monitoring device comprises four displacement sensors, and the four displacements are respectively arranged in the inner hole of the front bearing support in a surrounding manner corresponding to upper deflection, lower deflection, left deflection and right deflection, as shown in fig. 3. The displacement sensor corresponding to the upward deflection is referred to as an upward deflection sensor 201, and is used for monitoring a first offset of the rotor 110 in the upward deflection; a displacement sensor corresponding to the downward deflection is called a downward deflection sensor 202 and is used for monitoring a second offset of the rotor 110 in the downward deflection; the displacement sensor corresponding to the left deviation is called a left deviation sensor and is used for monitoring a third deviation amount of the rotor 110 in the left deviation; the displacement sensor corresponding to the right deviation is called a right deviation sensor, and is used for monitoring a fourth deviation amount of the rotor 110 in the right deviation.

Still further, optionally, four displacement sensors are circumferentially disposed in the inner bore of the rear bearing support corresponding to the upper deflection, the lower deflection, the left deflection and the right deflection, respectively. The rotor 110 is rigid, and when the front end of the rotor deflects upward, the rear end of the rotor deflects downward. Thus, the front bearing support and the rear bearing support are respectively provided with four displacement sensors, which is beneficial to determining the radial offset of the rotor 110 more accurately.

To illustrate the working process of the radial adjusting part, the first offset of the front end of the rotor is marked as a, and the first offset of the rear end of the rotor is marked as a'; the second offset of the front end of the rotor is marked as b, and the second offset of the rear end of the rotor is marked as b'; the third offset of the front end of the rotor is marked as c, and the third offset of the rear end of the rotor is marked as c'; the fourth offset of the front end of the rotor is denoted as d and the fourth offset of the rear end of the rotor is denoted as d'. When the bearing-rotor system is stable, the magnetic levitation radial bearing 200 is not started in this state, in which a is 0, b is 0, c is 0, and d is 0. When the rotor 110 is offset and the gap between the rotor 110 and the bearing becomes small, the offset is smaller than zero; when the rotor 110 is offset and the gap between the rotor 110 and the bearing becomes large, the offset amount is greater than zero.

In the event of a radial offset of the bearing-rotor system:

if a is less than 0 and a' is greater than 0, the front end of the rotor deflects upwards and the rear end of the rotor deflects downwards, and at the moment, the first controller increases the current of an upper coil of the front magnetic levitation radial bearing, so that the supporting force of the upper side of the front end of the rotor is increased; and/or the first controller increases the current of the lower coil of the rear magnetic levitation radial bearing, thereby increasing the supporting force of the lower side of the rear end of the rotor. In the same way as above, the first and second,

if b <0 and b' >0, the front end of the rotor deflects downwards and the rear end of the rotor deflects upwards, so that the current of the lower coil of the front magnetic levitation radial bearing is increased, and/or the current of the upper coil of the rear magnetic levitation radial bearing is increased.

If c is less than 0 and c' is greater than 0, the front end of the rotor deflects left and the rear end of the rotor deflects right simultaneously, so that the current of the left coil of the front magnetic levitation radial bearing is increased, and/or the current of the right coil of the rear magnetic levitation radial bearing is increased.

If d <0 and d' >0, the front end of the rotor generates right deflection and the rear end of the rotor generates left deflection, so that the current of the right coil of the front magnetic levitation radial bearing is increased, and/or the current of the left coil of the rear magnetic levitation radial bearing is increased.

In some embodiments, the first controller processes the offset signal of the radial offset by using an LMS algorithm (least mean square algorithm) and obtains a following signal; then, the first controller carries out superposition processing on the following signal and the offset signal to obtain an expected signal; then, the first controller processes the expected signal and obtains a control signal of the electromagnetic force; and finally, the first controller controls the currents of the electromagnetic coils according to the control signals, and the corresponding electromagnetic supporting forces of the different electromagnetic coils synchronously change when the currents of the different electromagnetic coils change. Therefore, in the process of radial offset of the rotor 110, the processing process of the offset signal is repeated, and further the radial offset of the rotor 110 tends to zero by continuously adjusting the electromagnetic supporting force of the electromagnetic coil, so that the stability of the bearing-rotor system is effectively improved.

In some embodiments, as shown in fig. 4 and 5, the radial adjustment portion further includes a plurality of auxiliary air passages 433. The two bearing blocks 431 are each provided with a shaft cover 432 for covering, wherein the shaft cover is referred to as a front shaft cover arranged on the side of the front bearing block remote from the stator 120, and the shaft cover is referred to as a rear shaft cover arranged on the side of the rear bearing block remote from the stator 120. The front air-floatation radial bearing and the front magnetic-levitation radial bearing are arranged behind the front bearing support, and the front shaft end cover is arranged on the front bearing support; the rear air-float radial bearing and the rear magnetic-float radial bearing are arranged behind the rear bearing support, and the rear shaft end cover is arranged on the rear bearing support. Furthermore, the front shaft end cover and the rear shaft end cover are respectively provided with a plurality of auxiliary air passages 433, each auxiliary air passage 433 corresponds to a radial offset direction, and all the auxiliary air passages 433 are communicated with a gap between the rotor 110 and the air-floating radial bearing 400. When the rotor 110 is deviated in a certain radial deviation direction, the auxiliary air duct 433 corresponding to the radial deviation direction is opened to supply air to the gap, so that the rotor 110 is effectively supported in the deviation direction, and the rotor 110 is balanced. The auxiliary air passage 433 and the magnetic levitation radial bearing 200 can be used in cooperation.

Illustratively, the front shaft end cover and the rear shaft end cover are respectively provided with inner holes for two ends of the rotor 110 to penetrate through, and four auxiliary air passages 433 are respectively arranged around the inner holes, namely an upper auxiliary air passage, a lower auxiliary air passage, a left auxiliary air passage and a right auxiliary air passage, and the four auxiliary air passages 433 respectively correspond to upper deviation, lower deviation, left deviation and right deviation.

If a is less than 0 and a' is greater than 0, the front end of the rotor deflects upwards while the rear end of the rotor deflects downwards, and then an upper auxiliary air passage of the front shaft end cover is opened and/or a lower auxiliary air passage of the rear shaft end cover is opened.

If b is less than 0 and b' is greater than 0, the front end of the rotor deflects downwards and the rear end of the rotor deflects upwards, and then a lower auxiliary air passage of the front shaft end cover is opened and/or an upper auxiliary air passage of the rear shaft end cover is opened.

If c is less than 0 and c' is greater than 0, the front end of the rotor deflects leftwards, and the rear end of the rotor deflects rightwards, and then the left auxiliary air passage of the front shaft end cover is opened, and/or the right auxiliary air passage of the rear shaft end cover is opened.

If d is less than 0 and d' is greater than 0, the front end of the rotor deflects to the right while the rear end of the rotor deflects to the left, and then the right auxiliary air passage of the front shaft end cover is opened and/or the left auxiliary air passage of the rear shaft end cover is opened.

In the case of a deflection of the rotor 110 due to insufficient air supply in the bearing-rotor system, the magnetic radial bearing 200 quickly balances the radial deflection of the rotor 110, and the magnetic radial bearing turns to the closed state after the rotor 110 is balanced. However, due to insufficient air supply to the bearing-rotor system, the rotor 110 may again deflect. In this case, the auxiliary air channel 433 and the magnetic levitation radial bearing 200 are simultaneously activated to rapidly balance the rotor 110 and supplement air to the gap between the rotor 110 and the magnetic levitation radial bearing 400, so as to prevent the rotor 110 from shifting again after being balanced.

Optionally, one solenoid valve is provided for each auxiliary air passage 433. The air supply amount of the auxiliary air passage 433 is adjusted by adjusting the opening degree of the electromagnetic valve. Under the condition that the auxiliary air passage 433 is matched with the magnetic levitation radial bearing 200 for use, the pressure in the bearing-rotor system is obtained, the required air supplement amount is determined, the opening degree of the opened electromagnetic valve of the auxiliary air passage 433 is adjusted according to the required air supplement amount, and the air is accurately supplemented to the gap between the rotor 110 and the magnetic levitation radial bearing 400 while the rotor 110 is balanced.

In some embodiments, the adjustment assembly further comprises an axial adjustment portion. The axial adjustment portion is used to balance the rotor 110 according to an axial offset amount of the rotor 110. Thus, the axial adjustment part and the radial adjustment part are combined, and the offset of the rotor 110 in the axial direction and the radial direction can be quickly and effectively balanced, thereby improving the stability of the compressor 100.

Optionally, the shaft body of the rotor 110 has a thrust disc 111. The thrust disk 111 is mounted to the rear bearing support and is located between the stator 120 and the rear air bearing. This shortens the length of rotor 110 as compared to providing thrust disc 111 at the end of rotor 110, thereby increasing the critical speed of rotor 110. The axial adjustment portion includes two thrust bearings respectively disposed on left and right sides of the thrust disc 111.

Further, optionally, the thrust bearing is an air bearing 300. With the thrust disk 111 as a boundary, a front air-floating axial bearing is located in front of the thrust disk 111 and close to the stator 120, and a rear air-floating axial bearing is located behind the thrust disk 111 and far from the stator 120. The axial adjustment portion further includes an axial monitoring device and a second controller. Wherein, the axial monitoring device is used for monitoring the axial offset of the rotor 110; the second controller is configured to adjust the amount of air supplied to the air bearing 300 according to the amount of axial displacement, thereby adjusting the pressure of the air bearing 300.

Still further, optionally, the axial offset direction of the rotor 110 includes a forward offset and a rearward offset, with the forward air bearing corresponding to the forward offset and the rearward air bearing corresponding to the rearward offset. As shown in fig. 2, the forward offset sensor 301 is disposed on the rear bearing support and located in front of the thrust disc 111, and is configured to monitor a fifth offset e of the forward offset of the rotor 110; a back-deflection sensor 302 is disposed on the back bearing support and behind the thrust disc 111 for monitoring a sixth deflection amount f of the rotor 110. In the case where the bearing-rotor system is stable, when e and f at this time are marked as 0, the air thrust bearing 300 is not activated in this state. When rotor 110 is offset and the clearance between thrust disc 111 and bearing mount 431 becomes smaller, the offset is smaller than zero; when the clearance between the thrust disc 111 and the bearing mount 431 becomes large, the offset amount is larger than zero.

If e <0 and f >0, the rotor 110 is deflected forward, and the second controller controls to turn on the front air bearing.

If e is greater than 0 and f is less than 0, the rotor 110 deflects, and the second controller controls the rear air bearing to be turned on.

In some embodiments, as shown in FIG. 1, compressor 100 also includes a motor cavity 130, a cooling inlet 131, and a return air port 132. The cooling inlet 131 is communicated with the motor cavity 130, and an external cooling medium is introduced into the motor cavity 130 through the cooling inlet 131 to cool the stator 120 in the motor cavity 130. In the refrigeration system, the evaporator is connected to a cooling inlet 131, and supplies a low-temperature and low-pressure refrigerant to the motor chamber 130 through the cooling inlet 131, and the low-temperature and low-pressure refrigerant exchanges heat with the stator 120 to be a medium-temperature and medium-pressure gas. The temperature and pressure of the gas at this time can meet the operating requirements of the air bearing 300.

Alternatively, the front and rear air bearings are each connected to the return air port 132 by a first air supply passage 303. Moreover, an electronic expansion valve is arranged on each first air supply passage 303, and the second controller adjusts the air supply amount of the first air supply passage 303 by controlling the opening degree of the electronic expansion valve, so as to adjust the pressure of the front air-floatation axial bearing and the rear air-floatation axial bearing, and further balance the axial offset of different degrees. Thus, the medium-temperature and medium-pressure gas is supplied to the air floatation axial bearing 300 through the air return port 132 and the first gas supply passage 303, an external gas supply device is not needed for supplying gas to the air floatation axial bearing 300, the cooling medium is reasonably utilized, and the structure is greatly simplified.

For example, when the rotor 110 is biased forward or backward, the second controller controls the electronic expansion valve to be fully opened if the absolute value of e or f is greater than a preset offset value, and controls the electromagnetic expansion valve to be half opened if the absolute value of e or f is less than the preset offset value. Therefore, the pressure of the front air-floatation axial bearing and the pressure of the rear air-floatation axial bearing are reasonably adjusted according to the axial offset.

Further, optionally, the air return port 132 is also communicated with the air-floating radial bearing 400 and the auxiliary air passages 433 for respectively supplying air to the air-floating axial bearing 300 and all the auxiliary air passages 433. The air supply to the front air-floating journal bearing and the air supply to the rear air-floating journal bearing are respectively communicated with the air return port 132 through a second air supply passage 401. Furthermore, an electronic expansion valve is disposed on each second air supply passage 401, and the second controller adjusts the air supply amount of the second air supply passage 401 by controlling the opening degree of the electronic expansion valve, thereby adjusting the air supply pressure of the front air-floatation journal bearing and the rear air-floatation journal bearing. Each auxiliary air passage 433 is connected to the air return port 132 through a third air supply passage, each third air supply passage is provided with an electronic expansion valve, and the air supply amount of the corresponding auxiliary air passage 433 is adjusted by controlling the opening degree of the electronic expansion valve. Therefore, an external gas supply device is not needed to supply gas to the air floatation radial bearing 400 and the auxiliary gas channel 433, the consistency of the gas supplied to the gap between the rotor 110 and the air floatation radial bearing 400 is ensured, and the influence of heat exchange of the gas with different temperatures and different pressures in the gap on the stability of the gas in the gap is avoided.

In some embodiments, as shown in FIG. 6, the thrust bearing is a magnetic levitation axial bearing 500. With the thrust disc 111 as a boundary, a front magnetic-levitation axial bearing is located in front of the thrust disc 111 and close to the stator 120, and a rear magnetic-levitation axial bearing is located behind the thrust disc 111 and far from the stator 120. The axial adjustment portion further comprises a third controller for adjusting the electromagnetic supporting force of the magnetic levitation axial bearing 500 according to the axial offset.

Optionally, the third controller processes the offset signal of the axial offset by using an LMS algorithm and obtains a following signal; then, the third controller carries out superposition processing on the following signal and the offset signal to obtain an expected signal; then, the third controller processes the expected signal and obtains a control signal of the electromagnetic force; finally, the third controller controls the current change in the magnetic levitation axial bearing 500 according to the control signal, thereby adjusting the electromagnetic supporting force of the magnetic levitation axial bearing 500. Therefore, in the process of axial deviation of the rotor 110, the processing process of the deviation signal is repeated, and the axial deviation of the rotor 110 tends to zero by continuously adjusting the electromagnetic supporting force, so that the stability of the bearing-rotor system is effectively improved.

The embodiment of the present disclosure provides a refrigeration system including the compressor 100 described in any of the above embodiments.

The above description and drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The embodiments of the present disclosure are not limited to the structures that have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A compressor, comprising:

a rotor (110);

a support assembly comprising two air-bearing radial bearings (400); the two air-floatation radial bearings (400) are respectively sleeved at two ends of the rotor (110) to support the rotor (110);

an adjustment assembly comprising a radial adjustment portion comprising two magnetically levitated radial bearings (200); the two magnetic levitation radial bearings (200) are respectively sleeved at two ends of the rotor (110), and electromagnetic supporting force is adjusted according to radial offset of the corresponding end of the rotor (110) to balance the rotor (110).

2. Compressor according to claim 1, characterized in that two said magnetic levitation radial bearings (200) are located on the side of one said air-bearing radial bearing (400) remote from the other said air-bearing radial bearing (400).

3. The compressor of claim 1 or 2, wherein the radial regulation portion further comprises:

radial monitoring means for monitoring said radial offset;

the first controller is electrically connected with the radial monitoring device and the magnetic levitation radial bearing (200) and used for adjusting the electromagnetic supporting force of the magnetic levitation radial bearing (200) according to the radial offset.

4. The compressor of claim 3, wherein the first controller processes the radial offset by a least mean square algorithm and obtains a follow signal, and controls the electromagnetic supporting force by the follow signal.

5. The compressor of claim 1 or 2, wherein the adjustment assembly further comprises:

an axial adjustment portion to balance the rotor (110) according to an axial offset of the rotor (110).

6. The compressor according to claim 5, characterized in that a thrust disc (111) is arranged on the shaft body of the rotor (110), and the thrust disc (111) is located between the two air-floatation radial bearings (400);

the axial adjustment portion includes:

the two thrust bearings are sleeved on the rotor (110) and are respectively close to two sides of the thrust disc (111).

7. The compressor of claim 6, wherein the thrust bearing is an air bearing (300);

the axial adjustment portion further includes:

axial monitoring means for monitoring said axial offset;

and a second controller for adjusting the amount of air supplied to the air-bearing axial bearing (300) according to the amount of axial displacement, thereby adjusting the pressure of the air-bearing axial bearing (300).

8. The compressor of claim 7, further comprising:

a motor cavity (130);

and the air return port (132) is communicated with the air floatation axial bearing (300) and is used for supplying the cooling medium in the motor cavity (130) to the air floatation axial bearing (300).

9. A compressor according to claim 6, characterized in that the thrust bearing is a magnetic levitation axial bearing (500).

10. A refrigeration system comprising a compressor as claimed in any one of claims 1 to 9.