A magnetic levitation compressor assembly and method of controlling the same

Abstract

The application provides a magnetic suspension compressor assembly and a control method thereof, wherein the magnetic suspension compressor assembly comprises a magnetic suspension compressor and a bypass flow path; the magnetic suspension compressor has a suction port and a discharge port; the magnetic suspension compressor introduces refrigerant to be compressed through the suction port and discharges the compressed refrigerant through the discharge port; the suction port can be opened or closed; the bypass flow path is connected between the upstream side of the suction port and the discharge port, so that the magnetic suspension compressor assembly can guide the refrigerant flowing to the suction port to the discharge port through the bypass flow path when the suction port is closed; and the bypass flow path can be opened or closed. According to the technical scheme of the application, the rotor of the magnetic suspension compressor can be prevented from being impacted by airflow external force during the start-up or shutdown stage, the magnetic suspension compressor can be normally started, and the rotor of the magnetic suspension compressor can be safely landed at zero speed during the shutdown.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of magnetic suspension compressor, and particularly relates to a magnetic suspension compressor assembly and a control method thereof. BACKGROUND

[0002] The magnetic suspension compressor utilizes the magnetic suspension bearing to enable the rotor to be suspended in a given space for rotation without friction. The starting step of the magnetic suspension compressor is generally to control the rotor to be suspended first, and then the frequency converter controls the rotor to rotate after the rotor is suspended, and the magnetic suspension compressor starts to work. However, in actual application, due to the characteristics of no oil, no contact and no friction of the magnetic suspension compressor system, after the rotor is suspended, the impeller at the front end of the rotor is easily driven to rotate by the external force of the airflow. For example, in the system installed with a fluorine pump, the fluorine pump is started when the system is started, so that the refrigerant flows and circulates in the system. At this time, the rotor is suspended, and if the circulating refrigerant impacts on the impeller, the impeller will drive the rotor to rotate. This state is very unfavorable for the frequency converter to control the rotor to be suspended and rotate. Firstly, the frequency converter controls the rotor to rotate, which requires starting from 0 speed. If there is an uncertain initial speed, it will cause control disorder, such as motor winding overcurrent, starting failure and the like, and in a serious case, the winding coil and components will be damaged. Secondly, the rotor is easily caused to lose stability in the stage of starting to be suspended due to the impact of the airflow external force, which leads to suspension failure and cannot start normally. In addition, during the process of shutting down, the rotor needs to be controlled to stop being suspended. If the rotor is rotated due to the impact of the airflow during this process, the rotor will lose stability or the rotor will rub against the protection bearing, which leads to the shortening of the service life of the protection bearing. SUMMARY

[0003] Therefore, the present application provides a magnetic suspension compressor assembly and a control method thereof, and mainly aims to solve the technical problem of how to reduce the impact of the airflow external force on the rotor of the magnetic suspension compressor during the starting or shutting down stage.

[0004] In order to solve the above problems, the present application provides a magnetic suspension compressor assembly, which comprises a magnetic suspension compressor and a bypass flow path. The magnetic suspension compressor has a suction port and an exhaust port. The magnetic suspension compressor introduces the refrigerant to be compressed through the suction port, and discharges the compressed refrigerant through the exhaust port.

[0005] The suction port is openable or closable. The bypass flow path is connected between the upstream side of the suction port and the exhaust port, so that the magnetic suspension compressor assembly can guide the refrigerant flowing to the suction port to the exhaust port through the bypass flow path when the suction port is closed. The bypass flow path is openable or closable.

[0006] In some embodiments, the magnetic suspension compressor assembly further comprises a first switch valve arranged on a pipeline between the bleed port and the suction port of the bypass flow path to control opening or closing of the suction port.

[0007] In some embodiments, a controllable opening degree guide vane mechanism is arranged at the suction port to control opening or closing of the suction port.

[0008] In some embodiments, the magnetic suspension compressor assembly further comprises a second switch valve arranged on the bypass flow path to control opening or closing of the bypass flow path.

[0009] The present application also provides a control method of the magnetic suspension compressor assembly as described in any one of the above.

[0010] When the magnetic suspension compressor is started, steps S11 and S12 are sequentially performed, step S11 is to control the suction port to be closed and the bypass flow path to be opened, and step S12 is to control the rotor of the magnetic suspension compressor to be suspended.

[0011] And / or, when the magnetic suspension compressor is stopped, steps S21 and S22 are sequentially performed, step S21 is to control the suction port to be closed and the bypass flow path to be opened, and step S22 is to control the rotor of the magnetic suspension compressor to stop being suspended.

[0012] In some embodiments, when the magnetic suspension compressor is started, steps S13 and S14 are sequentially performed after step S12, step S13 is to control the rotor of the magnetic suspension compressor to rotate to a target rotating speed, and step S14 is to control the suction port to be opened and the bypass flow path to be closed.

[0013] In some embodiments, in step S13, a rotating instruction is sent to a frequency converter by a unit controller to make the frequency converter control the rotor of the magnetic suspension compressor to rotate to a target rotating speed; wherein,

[0014] In step S12, a suspension instruction is sent to a bearing controller by a unit controller to make the bearing controller control the rotor of the magnetic suspension compressor to be suspended; wherein, after the unit controller sends the suspension instruction to the bearing controller in the step S12, a time delay a is added before the rotating instruction is sent to the frequency converter in the step S13.

[0015] And / or, in step S14, the suction port is controlled to be opened and the bypass flow path is controlled to be closed by a unit controller; wherein, after the unit controller sends the rotating instruction to the frequency converter in the step S13, a time delay b is added before the suction port is controlled to be opened and the bypass flow path is controlled to be closed in the step S14.

[0016] In some embodiments, before step S21, step S20 is further performed, which is: controlling the rotor of the magnetic suspension compressor to stop rotating.

[0017] In some embodiments, in step S21, the air inlet is controlled to be closed and the bypass flow path is controlled to be opened by the unit controller; in step S22, the suspension stopping instruction is sent to the bearing controller by the unit controller, so that the bearing controller controls the rotor of the magnetic suspension compressor to stop suspension; wherein, after the air inlet is controlled to be closed and the bypass flow path is controlled to be opened in step S21, the unit controller delays for a time c and then sends the suspension stopping instruction to the bearing controller in step S22.

[0018] The magnetic suspension compressor assembly and the control method thereof provided by the application have the following beneficial effects:

[0019] When the magnetic suspension compressor is started, the air inlet can be closed first to prevent the airflow from the air inlet from impacting the rotor to make the rotor rotate, so that the rotor can be prevented from being impacted by the airflow external force when starting, and the rotor can start from zero speed to suspend and rotate, so that the magnetic suspension compressor can be ensured to start normally. When the magnetic suspension compressor is stopped, the air inlet can be closed to ensure that the rotor is not impacted by the airflow before stopping suspension, and the rotor can be safely landed at zero speed. In addition, when the magnetic suspension compressor is started or stopped, the bypass flow path can be opened to ensure that the airflow of the unit system can circulate without being blocked when the rotor is suspended, rotated and stopped from zero speed. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. The drawings in the following description are only exemplary, and those skilled in the art can also obtain other implementation drawings according to the provided drawings without paying creative labor.

[0021] Figure 1 is a structural schematic diagram of the magnetic suspension compressor assembly of the application;

[0022] Figure 2 is a hardware circuit diagram of the magnetic suspension compressor assembly of the application;

[0023] Figure 3 is a control flow diagram of the magnetic suspension compressor of the magnetic suspension compressor assembly of the application when starting;

[0024] Figure 4is a control flow chart of the magnetic suspension compressor assembly of the present application when the magnetic suspension compressor is shut down;

[0025] Figure 5 is a start-up control flow chart of the unit controller;

[0026] Figure 6 is a shut-down control flow chart of the unit controller.

[0027] Reference signs are:

[0028] 1, magnetic suspension compressor; 2, bypass flow path; 3, first on-off valve; 4, second on-off valve; 5, unit controller; 6, bearing controller; 7, frequency converter; 21, air bleed port of the bypass flow path; 101, suction port; 102, discharge port. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative work under the premise that the scope of protection of the present application.

[0030] In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer relative to the contour of each component.

[0031] For purposes of the description hereinafter, spatial relative terms, such as "above", "below", "upper", "lower", and the like, can be used to describe the relative position of one element or feature to another element or feature as illustrated in the figures. It will be understood that the spatial relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "below" other elements or features would then be oriented "below" or "above" other elements or features. Thus, the exemplary term "above" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatial relative descriptors used herein interpreted accordingly.

[0032] In addition, it should be noted that the use of "first", "second", and the like words of distinction do not connote any actual physical or chronological order, but are merely used for convenience and clarity in identifying one element from another. Unless otherwise stated, the use of these words is not intended to imply a special relationship or order among the elements, and these terms are not intended to imply a special chronological or physical order among elements. Thus, these terms, to the extent they can be deemed to connote a special or chronological order, are used herein for ease of description and are not intended to imply that certain embodiments are necessarily relating to this or that order or sequence.

[0033] With reference to the drawings Figure 1 As shown, according to an embodiment of the present application, a magnetic suspension compressor assembly is provided, which includes a magnetic suspension compressor 1 and a bypass flow path 2. The magnetic suspension compressor 1 has a suction port 101 and a discharge port 102. The magnetic suspension compressor 1 introduces the refrigerant to be compressed through the suction port 101, and discharges the compressed refrigerant through the discharge port 102.

[0034] The suction port 101 can be opened or closed. The bypass flow path 2 is connected between the upstream side of the suction port 101 and the discharge port 102, so that the magnetic suspension compressor assembly can guide the refrigerant flowing toward the suction port 101 to the discharge port 102 through the bypass flow path 2 when the suction port 101 is closed. The bypass flow path 2 can be opened or closed.

[0035] In the above example, when the magnetic suspension compressor 1 is started, the suction port 101 can be closed first to prevent the airflow from the suction port 101 from impacting the rotor inside the magnetic suspension compressor 1 to cause the rotor to rotate, thereby avoiding the rotor from being impacted by the airflow external force when starting, ensuring that the rotor can start from 0 rpm and be suspended and rotated, so that the magnetic suspension compressor 1 can be started normally. When the magnetic suspension compressor 1 is stopped, the rotor can be ensured not to be affected by the airflow impact before stopping suspension by closing the suction port 101, so that the rotor can be safely landed at 0 rpm. In addition, when the magnetic suspension compressor 1 is started or stopped, the bypass flow path 2 can be opened to ensure that the airflow in the system can circulate without being blocked when the rotor is suspended, rotated, and stopped from 0 rpm.

[0036] It should be noted that the magnetic suspension compressor 1 also has a compression part, the suction port 101 is used to introduce the refrigerant to be compressed into the compression part, the compression part is used to compress the refrigerant introduced by the suction port 101, and the exhaust port 102 is used to discharge the refrigerant compressed by the compression part. Among them, the suction port 101, the compression part and the exhaust port 102 form a compression flow path. And the bypass flow path 2 and the compression flow path are parallel flow paths.

[0037] In order to realize the function that the suction port 101 can be opened or closed, in the first example, as shown in Figure 1 The foregoing magnetic suspension compressor assembly can also include a first switch valve 3. The first switch valve 3 can be arranged on the pipeline between the gas introduction port 21 of the bypass flow path and the suction port 101, so as to control the opening or closing of the suction port 101, and enable the magnetic suspension compressor assembly to introduce the refrigerant flowing to the suction port 101 to the exhaust port 102 through the bypass flow path 2 when the suction port 101 is closed. Among them, the first switch valve 3 can be an electromagnetic valve or an electric valve such as an electric butterfly valve.

[0038] In the second example, a controllable opening degree guide vane mechanism can be arranged at the suction port 101, which is used to control the opening or closing of the suction port 101, and enables the magnetic suspension compressor assembly to introduce the refrigerant flowing to the suction port 101 to the exhaust port 102 through the bypass flow path 2 when the suction port 101 is closed. Among them, the specific structure of the guide vane mechanism is a prior art, which will not be described here.

[0039] It should be noted that if the suction port 101 of the magnetic suspension compressor 1 is provided with a controllable opening degree guide vane mechanism, the foregoing first switch valve 3 is not required to be installed, and the guide vane mechanism can replace the foregoing first switch valve 3 to play the same control role, and both can realize the opening or closing of the suction port 101.

[0040] In some embodiments, as shown in Figure 1 The foregoing magnetic suspension compressor assembly can also include a second switch valve 4 arranged on the bypass flow path 2 to control the opening or closing of the bypass flow path 2. Among them, the second switch valve 4 can be an electromagnetic valve or an electric valve such as an electric butterfly valve.

[0041] The application also provides a control method of the foregoing magnetic suspension compressor assembly. In some embodiments, as shown in Figure 3 When the magnetic suspension compressor 1 is started, steps S11 and S12 can be sequentially performed. Step S11 is to control the suction port 101 to be closed and the bypass flow path 2 to be opened. Step S12 is to control the rotor of the magnetic suspension compressor 1 to be suspended.

[0042] In the control method, when the magnetic suspension compressor 1 is started, the suction port 101 is controlled to be closed and the bypass flow path 2 is controlled to be opened before the rotor is suspended, so that the airflow from the suction port 101 can not impact the rotor to make the rotor rotate before the rotor is suspended, and the airflow can flow through the bypass flow path 2, which does not affect the normal operation of the fluorine pump system of the unit, and the refrigerant can flow and circulate in the system normally.

[0043] In some embodiments, as shown in Figure 3 after step S12, steps S13 and S14 are sequentially performed. In step S13, the rotor of the magnetic suspension compressor 1 is controlled to rotate to a target rotating speed. After step S13, the rotor has a certain rotating speed and is not easily affected by the airflow before starting. In step S14, the suction port 101 is controlled to be opened and the bypass flow path 2 is controlled to be closed. After step S14, the refrigerant airflow can enter from the suction port 101 and be discharged from the exhaust port 102, and the magnetic suspension compressor 1 is started and normally loaded and operated.

[0044] In some embodiments, as shown in Figure 2 In the foregoing step S12, the unit controller 5 sends a suspension instruction to the bearing controller 6 to control the rotor of the magnetic suspension compressor 1 to be suspended. In the foregoing step S13, the unit controller 5 sends a rotating instruction to the frequency converter 7 to control the rotor of the magnetic suspension compressor 1 to rotate to a target rotating speed.

[0045] After the unit controller 5 sends the suspension instruction to the bearing controller 6 in step S12, the unit controller 5 sends a rotating instruction to the frequency converter 7 in step S13 after a delay time a. This design is mainly to enable the rotor to be suspended for time a before the rotor is driven to rotate by the frequency converter 7.

[0046] In some embodiments, the target rotating speed can satisfy 50 rpm < n < 500 rpm, and the delay time a satisfies 0 < a < 30 seconds.

[0047] In some embodiments, as shown in Figure 2 In the foregoing step S14, the unit controller 5 controls the suction port 101 to be opened and the bypass flow path 2 to be closed. After the unit controller 5 sends the rotating instruction to the frequency converter 7 in step S13, the unit controller 5 controls the suction port 101 to be opened and the bypass flow path 2 to be closed in step S14 after a delay time b. This design is mainly to enable the rotor to reach the target rotating speed for time b before the suction port 101 is opened, and the rotor has a certain rotating speed and is not easily affected by the airflow before starting.

[0048] In some embodiments, the time b satisfies: 5 seconds < b < 30 seconds.

[0049] In some embodiments, as shown in FIG. 6, when the magnetic suspension compressor 1 is shut down, the step S21 and the step S22 can be sequentially executed. The step S21 is to control the suction port 101 to be closed and the bypass flow path 2 to be opened. The step S22 is to control the rotor of the magnetic suspension compressor 1 to stop suspension. Figure 4

[0050] In the above control method, when the magnetic suspension compressor 1 is shut down, the suction port 101 is controlled to be closed and the bypass flow path 2 is controlled to be opened before the rotor stops suspension, so that the rotor is not affected by the airflow impact before the rotor stops suspension and does not rotate; at the same time, the airflow can flow through the bypass flow path 2, so that the airflow in the system can circulate after the shutdown and is not blocked.

[0051] In some embodiments, as shown in FIG. 7, when the magnetic suspension compressor 1 is shut down, the step S20 is further executed before the step S21. The step S20 is to control the rotor of the magnetic suspension compressor 1 to stop rotation. In this way, the rotor stops rotation before stopping suspension, so as to avoid the rotor rotating and rubbing against the protection bearing when the rotor stops suspension, thereby affecting the service life. Figure 4

[0052] In some embodiments, as shown in FIG. 8, in the step S21, the suction port 101 can be controlled to be closed and the bypass flow path 2 can be opened by the unit controller 5. In the step S22, the unit controller 5 can send a suspension stopping instruction to the bearing controller 6, so that the bearing controller 6 controls the rotor of the magnetic suspension compressor 1 to stop suspension. In this way, the unit controller 5 sends the suspension stopping instruction to the bearing controller 6 in the step S22 after a delay time c after the unit controller 5 controls the suction port 101 to be closed and the bypass flow path 2 to be opened in the step S21. This design is mainly to make the rotor stop rotation within the time c, i.e., the rotation speed is 0 rpm, before the suction port 101 is opened, so as to avoid the rotor rotating and rubbing against the protection bearing when the rotor stops suspension, thereby affecting the service life. Figure 2 In some embodiments, the time c satisfies: 10 seconds < c < 60 seconds. In addition, after the bearing controller 6 receives the suspension stopping instruction, the rotor stops suspension after a delay time d, the rotor safely lands on the protection bearing, and the shutdown is completed. In this way, the time d satisfies: 0 < d < 30 seconds.

[0053]

[0054] ​​​It should be noted that in some embodiments, the aforementioned air inlet 101 is opened or closed by the first switch valve 3, and the aforementioned bypass flow path 2 is opened or closed by the second switch valve 4. When the first switch valve 3 and the second switch valve 4 are both solenoid valves, the unit controller 5 controls the first switch valve 3 to open or close the air inlet 101, and the unit controller 5 controls the second switch valve 4 to open or close the bypass flow path 2.

[0055] The aforementioned bearing controller 6 can be a bearing controller that the magnetic levitation compressor 1 has by itself, and similarly, the aforementioned frequency converter 7 can be a frequency converter that the magnetic levitation compressor 1 has by itself.

[0056] For the convenience of understanding, the present application gives a specific control method of a magnetic levitation compressor assembly, combined with Figure 5 The unit controller 5 receives the compressor start instruction from the user, then controls the second switch valve 4 on the bypass flow path 2 to open, and controls the first switch valve 3 at the air inlet 101 to close, preventing airflow from entering the magnetic levitation compressor 1 from the air inlet 101 to cause the rotor to rotate and be impacted, and ensuring that the airflow can flow through the bypass flow path 2 without affecting the normal operation of the unit fluorine pump system. The fluorine pump system circulates the refrigerant in the unit. For example, in a system equipped with a fluorine pump, the fluorine pump is started before the compressor starts to circulate the refrigerant in the system, and the fluorine pump is widely used in central air conditioning. Next, the unit controller 5 sends a levitation instruction to the bearing controller 6 of the magnetic levitation compressor 1, and the bearing controller 6 controls the rotor to levitate after receiving the instruction, and waits for a delay a (0 < a < 30) seconds for the rotor to complete levitation. Next, the unit controller 5 sends a rotation instruction to the frequency converter 7, and the frequency converter 7 controls the compressor rotor to rotate from 0 rpm to a target speed n (50 rpm < n < 500 rpm) after receiving the instruction, and waits for a delay b (5 < b < 30) seconds for the compressor rotor to reach the target speed. At this time, the compressor rotor has a certain speed and is not easily affected by the airflow before starting; next, the unit controller 5 controls the first switch valve 3 at the air inlet 101 to open, and controls the second switch valve 4 on the bypass flow path 2 to close, to ensure that the refrigerant airflow enters from the air inlet 101 and exits from the air outlet 102, and the compressor completes the start and normal load operation.

[0057] Combined with Figure 6The shutdown control flowchart of the unit controller 5, the unit controller 5 receives the user's compressor shutdown instruction, the next step is that the unit controller 5 sends a stop rotating instruction to the frequency converter 7, and the frequency converter 7 controls the rotor to stop rotating after receiving the instruction; the next step is that the unit controller 5 controls the second switch valve 4 on the bypass flow path 2 to open, and controls the first switch valve 3 at the suction port 101 to close, so as to ensure that the rotor is not affected by the airflow impact before stopping suspension, and no rotation occurs; the next step is to wait for the rotor to stop falling for c (10 < c < 60) seconds, that is, the rotor speed is reduced to 0 rpm, the unit controller 5 sends a stop suspension instruction to the bearing controller 6, the bearing controller 6 controls the rotor to stop suspension after receiving the instruction, waits for the rotor to stop suspension for d (0 < d < 30) seconds, the rotor safely lands on the protection bearing, and the shutdown is completed.

[0058] Wherein, the application can solve the problem that the magnetic suspension compressor 1 cannot be normally started due to the rotor being rotated by external force and the rotor being unable to normally suspend and rotate; and can also solve the problem that the rotor is impacted by airflow during the process of stopping suspension, rotation occurs, the rotor is easily unstable or the rotor is rubbed with the protection bearing, and the use of the protection bearing is affected and shortened.

[0059] The technical scheme of the application can control the rotor to keep 0 rpm during the process of suspension, control the rotor to normally suspend; and can also control the rotor to keep 0 rpm after suspension, start rotating from 0 rpm, improve the reliability of the magnetic suspension compressor 1; and can also control the rotor to ensure that the rotor speed is 0 rpm when stopping suspension, ensure that the rotor safely lands without friction, and prolong the service life of the protection bearing.

[0060] Wherein, the first switch valve 3 (or the guide vane mechanism), the second switch valve 4, the bearing controller 6 of the magnetic suspension compressor 1, the frequency converter 7 of the magnetic suspension compressor 1 and the unit controller 5 form a unit control device of the magnetic suspension compressor 1. When the first switch valve 3 and the second switch valve 4 are both electromagnetic valves, the unit controller 5 can control the opening or closing of the first switch valve 3 and the second switch valve 4, and can send a suspension instruction or a stop suspension instruction to the bearing controller 6 of the magnetic suspension compressor 1, and can send a rotating instruction, a rotating speed instruction or a stop rotating instruction to the frequency converter 7 of the compressor.

[0061] Those skilled in the art can easily understand that the advantageous technical features of the above-mentioned modes can be freely combined and superimposed without conflict.

[0062] The above merely describes preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above merely describes preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A magnetic levitation compressor assembly, characterized by, The magnetic suspension compressor (1) has a suction port (101) and a discharge port (102), the magnetic suspension compressor (1) introduces the refrigerant to be compressed through the suction port (101), and discharges the compressed refrigerant through the discharge port (102); Wherein, the suction port (101) can be opened or closed; the bypass flow path (2) is communicated between the upstream side of the suction port (101) and the discharge port (102), so that the magnetic suspension compressor assembly can guide the refrigerant flowing to the suction port (101) to the discharge port (102) through the bypass flow path (2) when the suction port (101) is closed; the bypass flow path (2) can be opened or closed; The magnetic suspension compressor (1) closes the suction port (101) and opens the bypass flow path (2) when starting or stopping.

2. The magnetic suspension compressor assembly according to claim 1, wherein: The magnetic suspension compressor assembly further comprises a first switch valve (3) arranged on the pipeline between the air inlet port (21) of the bypass flow path and the suction port (101) to control the opening or closing of the suction port (101).

3. The magnetic suspension compressor assembly according to claim 1, wherein: A controllable opening degree guide vane mechanism is arranged at the suction port (101) to control the opening or closing of the suction port (101).

4. The magnetic suspension compressor assembly according to any one of claims 1-3, wherein: The magnetic suspension compressor assembly further comprises a second switch valve (4) arranged on the bypass flow path (2) to control the opening or closing of the bypass flow path (2).

5. A control method of the magnetic suspension compressor assembly according to any one of claims 1-4, wherein: When the magnetic suspension compressor (1) starts, steps S11 and S12 are sequentially performed, step S11 is to control the suction port (101) to be closed and the bypass flow path (2) to be opened, and step S12 is to control the rotor of the magnetic suspension compressor (1) to be suspended; And / or, when the magnetic suspension compressor (1) stops, steps S21 and S22 are sequentially performed, step S21 is to control the suction port (101) to be closed and the bypass flow path (2) to be opened, and step S22 is to control the rotor of the magnetic suspension compressor (1) to stop suspending.

6. The control method according to claim 5, wherein: When the magnetic suspension compressor (1) starts, steps S13 and S14 are sequentially performed after step S12, step S13 is to control the rotor of the magnetic suspension compressor (1) to rotate to a target speed, and step S14 is to control the suction port (101) to be opened and the bypass flow path (2) to be closed.

7. The control method according to claim 6, characterized in that: In step S13, the machine set controller (5) sends a rotating instruction to the frequency converter (7) to control the rotor of the magnetic suspension compressor (1) to rotate to a target rotating speed; wherein, In step S12, the machine set controller (5) sends a suspension instruction to the bearing controller (6) to control the rotor of the magnetic suspension compressor (1) to suspend; wherein, after the machine set controller (5) sends the suspension instruction to the bearing controller (6) in step S12, the machine set controller (5) delays for a time a and then sends a rotating instruction to the frequency converter (7) in step S13. And / or, in step S14, the machine set controller (5) controls the suction port (101) to open and the bypass flow path (2) to close; wherein, after the machine set controller (5) sends the rotating instruction to the frequency converter (7) in step S13, the machine set controller (5) delays for a time b and then controls the suction port (101) to open and the bypass flow path (2) to close in step S14.

8. The control method according to claim 5, characterized in that: When the magnetic suspension compressor (1) is shut down, step S20 is further performed before step S21, wherein step S20 is to control the rotor of the magnetic suspension compressor (1) to stop rotating.

9. The control method according to claim 8, characterized in that: In step S21, the machine set controller (5) controls the suction port (101) to close and the bypass flow path (2) to open; in step S22, the machine set controller (5) sends a stop suspension instruction to the bearing controller (6) to control the rotor of the magnetic suspension compressor (1) to stop suspending; wherein, after the machine set controller (5) controls the suction port (101) to close and the bypass flow path (2) to open in step S21, the machine set controller (5) delays for a time c and then sends the stop suspension instruction to the bearing controller (6) in step S22.

Images