Rotor position confirmation method, device, centrifugal compressor and storage medium

Abstract

The application provides a rotor position confirmation method and device, a centrifugal compressor and a storage medium. The centrifugal compressor comprises a rotor, a first bearing, a second bearing, a first position sensor and a second position sensor. The position confirmation method comprises obtaining a first distance, a second distance, a third distance and a fourth distance of the first bearing, the second bearing, the first position sensor and the second position sensor from a centroid of the rotor in a first direction, detecting a fifth distance of the first position sensor from the rotor in a second direction and a sixth distance of the second position sensor from the rotor in the second direction, calculating a first target distance of the first bearing from the rotor in the second direction according to the first distance, the third distance, the fourth distance, the fifth distance and the sixth distance, and calculating a second target distance of the second bearing from the rotor in the second direction according to the second distance, the third distance, the fourth distance, the fifth distance and the sixth distance.

Description

Technical Field

[0001] This invention relates to the field of magnetic levitation technology, and in particular to a rotor position confirmation method, position confirmation device, centrifugal compressor, and storage medium. Background Technology

[0002] Magnetic levitation compressors are widely used in refrigeration, medical, and other industries due to their characteristics of no mechanical loss, no lubrication required, low wear and tear, and low operating noise. A magnetic levitation compressor includes components such as magnetic bearings, a high-speed magnetic levitation rotor, a magnetic bearing controller, and position sensors. Magnetic levitation compressors ensure that the rotor remains suspended within the bearings, whether in a static state or at high speed, with a levitation precision down to the micrometer level.

[0003] Magnetic levitation compressors mostly use slender rotors. Therefore, position sensors and magnetic levitation bearings can be placed at different positions on the slender rotor according to design requirements. The position sensor detects the rotor's position, ensuring that the rotor does not collide with the protective bearing during rotation, reducing wear on the protective bearing and thus reducing the frequency of disassembly and component replacement. However, if the protective bearing and the position sensor are installed far apart, the displacement data collected by the position sensor may not accurately reflect the rotor's true position within the protective bearing. Furthermore, the slender rotor may exhibit both translational and conical motion during high-speed rotation, potentially leading to situations where the protection threshold is not triggered even though the rotor has already worn into the protective bearing. Summary of the Invention

[0004] In view of this, embodiments of the present invention provide a rotor position confirmation method, a position confirmation device, a centrifugal compressor, and a non-volatile computer-readable storage medium.

[0005] The rotor position confirmation method provided by this invention is used in a centrifugal compressor. The centrifugal compressor includes a rotor, a first bearing, a second bearing, a first position sensor, and a second position sensor. The rotor passes through the first bearing and the second bearing. The first position sensor is located on one side of the first bearing, and the second position sensor is located on one side of the second bearing. The position confirmation method includes:

[0006] The first distance, second distance, third distance, and fourth distance between the first bearing, the second bearing, the first position sensor, the second position sensor, and the centroid of the rotor in a first direction are respectively obtained;

[0007] The fifth distance between the first position sensor and the rotor in the second direction and the sixth distance between the second position sensor and the rotor in the second direction are detected, wherein the first direction is perpendicular to the second direction;

[0008] The first target distance between the first bearing and the rotor in the second direction is calculated based on the first distance, the third distance, the fourth distance, the fifth distance, and the sixth distance.

[0009] The second target distance between the second bearing and the rotor in the second direction is calculated based on the second distance, the third distance, the fourth distance, the fifth distance, and the sixth distance.

[0010] In some embodiments, the centrifugal compressor further includes a third position sensor and a fourth position sensor, and the position confirmation method further includes:

[0011] Obtain the seventh and eighth distances between the third position sensor, the fourth position sensor, and the centroid of the rotor in the first direction;

[0012] The ninth distance between the third position sensor and the rotor in a third direction and the tenth distance between the fourth position sensor and the rotor in a third direction are detected, wherein the third direction is perpendicular to the first direction and the second direction, respectively;

[0013] Calculate the third target distance between the first bearing and the rotor in a third direction based on the first distance, the seventh distance, the eighth distance, the ninth distance, and the tenth distance;

[0014] The fourth target distance between the second bearing and the rotor in a third direction is calculated based on the second distance, the seventh distance, the eighth distance, the ninth distance, and the tenth distance.

[0015] In some implementations, the seventh distance is equal to the third distance, and the eighth distance is equal to the fourth distance.

[0016] In some embodiments, the centrifugal compressor further includes a magnetic levitation bearing, and the position confirmation method further includes:

[0017] The magnitude and direction of the coil current of the magnetic levitation bearing are controlled according to at least one of the first target position and the third target position.

[0018] In some embodiments, controlling the magnitude and direction of the coil current of the magnetic levitation bearing based on at least one of the first target position and the third target position includes:

[0019] If the first target distance is less than a first distance threshold, control the magnitude and direction of the coil current of the magnetic levitation bearing to make the first target distance greater than or equal to the first distance threshold; and / or

[0020] If the distance to the third target is less than the second distance threshold, the magnitude and direction of the coil current of the magnetic levitation bearing are controlled so that the distance to the third target is greater than or equal to the second distance threshold.

[0021] In some embodiments, the centrifugal compressor further includes a magnetic levitation bearing, and the position confirmation method further includes:

[0022] At least one of the second target position and the fourth target position controls the magnitude and direction of the coil current of the magnetic levitation bearing.

[0023] In some embodiments, at least one of the second target position and the fourth target position controls the magnitude and direction of the coil current in the magnetic levitation bearing, including:

[0024] If the second target distance is less than the third distance threshold, control the magnitude and direction of the coil current of the magnetic levitation bearing to make the second target distance greater than or equal to the third distance threshold; and / or

[0025] If the distance to the fourth target is less than the fourth distance threshold, the magnitude and direction of the coil current of the magnetic levitation bearing are controlled so that the distance to the fourth target is greater than or equal to the fourth distance threshold.

[0026] The rotor position confirmation device according to the embodiments of this application is used for a centrifugal compressor. The centrifugal compressor includes the rotor, a first bearing, a second bearing, a first position sensor, and a second position sensor. The rotor passes through the first bearing and the second bearing. The first position sensor is located on one side of the first bearing, and the second position sensor is located on one side of the second bearing. The position confirmation device includes:

[0027] The acquisition module is used to acquire, respectively, the first distance, the second distance, the first position sensor, and the second position sensor from the centroid of the rotor in a first direction, and the fourth distance.

[0028] The detection module is used to detect the fifth distance between the first position sensor and the rotor in a second direction and the sixth distance between the second position sensor and the rotor in a second direction, wherein the first direction is perpendicular to the second direction;

[0029] The first calculation module is used to calculate the first target distance between the first bearing and the rotor in the second direction based on the first distance, the third distance, the fourth distance, the fifth distance, and the sixth distance;

[0030] The second calculation module is used to calculate the second target distance between the second bearing and the rotor in the second direction based on the second distance, the third distance, the fourth distance, the fifth distance and the sixth distance.

[0031] The centrifugal compressor of this application includes a processor and a memory. The memory stores a computer program, which, when executed by the processor, causes the processor to implement the rotor position confirmation method.

[0032] The non-volatile computer-readable storage medium of this application includes a computer program that, when executed by a processor, causes the processor to implement the rotor position confirmation method.

[0033] In the rotor position confirmation method, position confirmation device, centrifugal compressor, and storage medium of this application, by acquiring the first distance between the first bearing and the rotor's center of mass in the first direction, the second distance between the second bearing and the rotor's center of mass in the first direction, the third distance between the first position sensor and the rotor's center of mass in the first direction, the fourth distance between the second position sensor and the rotor's center of mass in the first direction, and detecting the fifth distance between the first position sensor and the rotor in the second direction and the sixth distance between the second position sensor and the rotor in the second direction, the first target distance between the first bearing and the rotor in the second direction can be accurately calculated based on the first, third, fourth, fifth, and sixth distances, and the second target distance between the second bearing and the rotor in the second direction can be accurately calculated based on the second, third, fourth, fifth, and sixth distances. This allows for rotor position control based on the first and second target distances, thereby preventing situations where the rotor has worn down to the first and / or second bearings without triggering a protection value during operation.

[0034] Additional aspects and advantages of the embodiments of this application 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 this application. Attached Figure Description

[0035] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of embodiments taken in conjunction with the accompanying drawings, wherein:

[0036] Figure 1 This is a schematic flowchart of a rotor position confirmation method according to certain embodiments of the present invention;

[0037] Figure 2 This is a schematic diagram of the rotor position confirmation device according to certain embodiments of the present invention;

[0038] Figure 3 This is a schematic diagram of a centrifugal compressor according to certain embodiments of the present invention;

[0039] Figure 4 This is a schematic diagram of the structure of a centrifugal compressor according to certain embodiments of the present invention;

[0040] Figure 5 This is a side view of a centrifugal compressor according to certain embodiments of the present invention;

[0041] Figure 6 This is another side view of the centrifugal compressor according to certain embodiments of the present invention;

[0042] Figure 7 These are structural design drawings of centrifugal compressors according to certain embodiments of the present invention;

[0043] Figure 8 This is a geometric model diagram of a centrifugal compressor according to certain embodiments of the present invention;

[0044] Figure 9 This is a schematic flowchart of a rotor position confirmation method according to certain embodiments of the present invention;

[0045] Figure 10 This is yet another structural design drawing of a centrifugal compressor according to certain embodiments of the present invention;

[0046] Figure 11 This is yet another geometric model diagram of a centrifugal compressor according to certain embodiments of the present invention;

[0047] Figure 12 This is a schematic flowchart of a rotor position confirmation method according to certain embodiments of the present invention;

[0048] Figure 13 This is a schematic diagram of the rotor position confirmation device according to certain embodiments of the present invention;

[0049] Figure 14-16 This is a schematic flowchart of a rotor position confirmation method according to certain embodiments of the present invention.

[0050] Main component labels in the attached diagram

[0051] Location confirmation device 10, acquisition module 11, detection module 12, first calculation module 13, second calculation module 14, control module 15;

[0052] Centrifugal compressor 100, processor 20, memory 30, rotor 101, first bearing 102, second bearing 103, first position sensor 104, second position sensor 105, third position sensor 106, fourth position sensor 107, first direction Z, second direction FX, third direction FY. Detailed Implementation

[0053] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0054] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0055] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0056] Please see Figure 1 and Figure 4 This application provides a rotor position confirmation method for a centrifugal compressor 100. The centrifugal compressor 100 includes a rotor 101, a first bearing 102, a second bearing 103, a first position sensor 104, and a second position sensor 105. The rotor 101 passes through the first bearing 102 and the second bearing 103. The first position sensor 104 is located on one side of the first bearing 102, and the second position sensor 105 is located on one side of the second bearing 103. The rotor 101 position confirmation method includes:

[0057] 01. Obtain the first distance, second distance, third distance, and fourth distance between the first bearing, the second bearing, the first position sensor, the second position sensor, and the rotor's center of mass in the first direction, respectively;

[0058] 02, Detect the fifth distance between the first position sensor and the rotor in the second direction and the sixth distance between the second position sensor and the rotor in the second direction, wherein the first direction is perpendicular to the second direction;

[0059] 03. Calculate the first target distance between the first bearing and the rotor in the second direction based on the first distance, third distance, fourth distance, fifth distance, and sixth distance;

[0060] 04. Calculate the second target distance between the second bearing and the rotor in the second direction based on the second distance, third distance, fourth distance, fifth distance and sixth distance.

[0061] Please see Figure 2 This application provides a rotor position confirmation device 10. It is used in a centrifugal compressor 100, which includes a rotor 101, a first bearing 102, a second bearing 103, a first position sensor 104, and a second position sensor 105. The rotor 101 passes through the first bearing 102 and the second bearing 103. The first position sensor 104 is located on one side of the first bearing 102, and the second position sensor 105 is located on one side of the second bearing 103. The position confirmation device 10 includes an acquisition module 11, a detection module 12, a first calculation module 13, and a second calculation module 14. Step 01 can be implemented by the acquisition module 11, step 02 by the detection module 12, step 03 by the first calculation module 13, and step 04 by the second calculation module 14.

[0062] Alternatively, the acquisition module 11 can be used to acquire the first distance, second distance, third distance and fourth distance between the first bearing, the second bearing, the first position sensor and the second position sensor and the centroid of the rotor in the first direction, respectively;

[0063] The detection module 12 can be used to detect the fifth distance between the first position sensor and the rotor in the second direction and the sixth distance between the second position sensor and the rotor in the second direction, wherein the first direction is perpendicular to the second direction;

[0064] The first calculation module 13 can be used to calculate the first target distance between the first bearing and the rotor in the second direction based on the first distance, the third distance, the fourth distance, the fifth distance, and the sixth distance;

[0065] The second calculation module 14 can be used to calculate the second target distance between the second bearing and the rotor in the second direction based on the second distance, the third distance, the fourth distance, the fifth distance, and the sixth distance.

[0066] Please combine Figure 3 This application also provides a centrifugal compressor 100, which includes a processor 20 and a memory 30. The memory 30 stores a computer program. When the computer program is executed by the processor 20, the processor 20 implements the above-described rotor position confirmation method. That is, the processor 20 can be used to obtain the first distance, second distance, third distance, and fourth distance between the first bearing, the second bearing, the first position sensor, the second position sensor, and the rotor's center of mass in a first direction, respectively; and detect the fifth distance between the first position sensor and the rotor in a second direction and the sixth distance between the second position sensor and the rotor in a second direction, wherein the first direction is perpendicular to the second direction; the processor 20 can also be used to calculate the first target distance between the first bearing and the rotor in a second direction based on the first distance, the third distance, the fourth distance, the fifth distance, and the sixth distance, and to calculate the second target distance between the second bearing and the rotor in a second direction based on the second distance, the third distance, the fourth distance, the fifth distance, and the sixth distance.

[0067] In the rotor position confirmation method, position confirmation device 10, and centrifugal compressor 100 of this application, by acquiring the first distance between the first bearing and the rotor's center of mass in the first direction, the second distance between the second bearing and the rotor's center of mass in the first direction, the third distance between the first position sensor and the rotor's center of mass in the first direction, the fourth distance between the second position sensor and the rotor's center of mass in the first direction, and detecting the fifth distance between the first position sensor and the rotor in the second direction and the sixth distance between the second position sensor and the rotor in the second direction, the first target distance between the first bearing and the rotor in the second direction can be accurately calculated based on the first, third, fourth, fifth, and sixth distances, and the second target distance between the second bearing and the rotor in the second direction can be accurately calculated based on the second, third, fourth, fifth, and sixth distances. Thus, the rotor position can be controlled based on the first and second target distances, thereby preventing the rotor from rubbing against the protective bearing during operation.

[0068] In some embodiments, the position confirmation device 10 may be part of the centrifugal compressor 100. In other words, the centrifugal compressor 100 includes the position confirmation device 10.

[0069] In some embodiments, the location confirmation device 10 may be a discrete component assembled in a certain way to have the aforementioned functions, or a chip having the aforementioned functions in the form of an integrated circuit, or a computer software code segment that enables the processor 20 to have the aforementioned functions when running on the processor 20.

[0070] In some implementations, the position confirmation device 10 may be installed as hardware, either independently or as an additional peripheral component, onto the centrifugal compressor 100. The position confirmation device 10 may also be integrated into the centrifugal compressor 100; for example, when the position confirmation device 10 is part of the centrifugal compressor 100, it may be integrated into the processor 20.

[0071] In some embodiments where the position confirmation device 10 is part of the centrifugal compressor 100, as software, the code segment corresponding to the position confirmation device 10 can be stored in the memory 30 and executed by the processor 20 to implement the aforementioned functions. Alternatively, the position confirmation device 10 includes the aforementioned computer program, or the aforementioned computer program includes the position confirmation device 10.

[0072] Please combine Figure 4-7 It should be noted that the first direction Z is parallel to the axis of the first bearing 102, and the second direction FX is perpendicular to the first direction Z. The second direction FX can be transverse. The first direction Z and the second direction FX can together form a transverse detection surface, which is parallel to the horizontal plane.

[0073] Specifically, the centrifugal compressor 100 can be a magnetic levitation compressor. In essence, a magnetic levitation compressor is a highly efficient and energy-saving centrifugal compressor that uses magnetic bearings to keep the compressor rotor in a suspended state during operation, thus preventing mechanical contact between the rotor and the base and avoiding mechanical friction. Magnetic levitation compressors do not require a lubrication system, thereby reducing heat exchange resistance and improving heat exchange efficiency. Furthermore, they do not require preheating, allowing for rapid start-up with low starting current. This simplifies the machine structure, and also results in low operating noise and vibration.

[0074] The centrifugal compressor 100 may include a rotor 101, bearings, and a position sensor. The rotor 101 may be an elongated rotor. The bearings are annular and may include a first bearing 102, a second bearing 103, and a magnetic levitation bearing (not shown). The first bearing 102 and the second bearing 103 are spaced apart, and the center line of the first bearing 102 coincides with the center line of the second bearing 103. The magnetic levitation bearing is located between the first bearing 102 and the second bearing 103. The rotor 101 passes through the first bearing 102, the magnetic levitation bearing, and the second bearing 103.

[0075] The first bearing 102 and the second bearing 103 are protective bearings, used to protect the rotor 101. When the rotor 101 contacts the inner wall of the protective bearing, the protective bearing provides a certain supporting force to the rotor 101 and also prevents the rotor 101 from touching the position sensor. The magnetic levitation bearing is used to levitate the rotor 101 in the air using magnetic force. When the centrifugal compressor 100 is working normally, the magnetic levitation bearing provides magnetic levitation force to the rotor, causing the rotor 101 to levitate between the first bearing 102 and the second bearing 103 and rotate at high speed.

[0076] The position sensor is spaced apart from the rotor 101 and located between the first bearing 102 and the second bearing 103. The position sensor includes a first position sensor 104 and a second position sensor 105. The first position sensor 104 is located on one side of the first bearing 102, and the second position sensor 105 is located on one side of the second bearing 103. The first position sensor 104 and the second position sensor 105 are respectively used for displacement data of the rotor 101 in the second direction FX.

[0077] Furthermore, both the first position sensor 104 and the second position sensor 105 may include two, with the two first position sensors 104 being symmetrical about the center line of the first bearing 102, and the two second position sensors 105 being symmetrically arranged about the center line of the second bearing 103.

[0078] The first bearing 102 and the first position sensor 104 can be adjacent or spaced apart. Similarly, the second bearing 103 and the second position sensor 105 can be adjacent or spaced apart. Understandably, if the first bearing 102 and the first position sensor 104 are adjacent, the displacement data detected by the first position sensor 104 can be approximately equal to the actual position of the rotor 101 in the bearing, which can easily lead to a first-order modal frequency lower than the rated speed, greatly increasing the control difficulty of the magnetic levitation bearing. Therefore, in this embodiment, the first bearing 102 and the first position sensor 104 are spaced apart, and the second bearing 103 and the second position sensor 105 are spaced apart (e.g., ...). Figure 7 ).

[0079] In step 01, since the installation positions of the first bearing 102, the second bearing 103, the first position sensor 104, and the second position sensor 105 remain unchanged, and the center of mass of the rotor 101 does not change, the first distance between the center of mass of the first bearing 102 and the center of mass of the rotor 101 in the first direction Z, the second distance between the center of mass of the second bearing 103 and the center of mass of the rotor 101 in the first direction Z, the third distance between the center of mass of the first position sensor 104 and the center of mass of the rotor 101 in the first direction Z, and the fourth distance between the center of mass of the second position sensor 105 and the center of mass of the rotor 101 in the first direction Z remain unchanged and are fixed values. These values ​​are determined from the time the centrifugal compressor 100 is installed. Therefore, the processor 20 can obtain the first distance, the second distance, the third distance, or the fourth distance according to the structural design drawing of the centrifugal compressor 100.

[0080] The fifth distance between the first position sensor 104 and the rotor 101 in the second direction FX can be detected in real time by the first position sensor 104, and the sixth distance between the second position sensor 105 and the rotor 101 in the second direction FX can be detected by the second position sensor 105. That is to say, the processor 20 can detect the fifth distance through the first position sensor 104 and obtain the sixth distance through the second position sensor 105.

[0081] Please combine Figure 7-8 A geometric model of the centrifugal compressor 100 is constructed based on the first, second, third, fourth, fifth, and sixth distances. In the geometric model, L... a For the first distance, L b For the second distance, L s1 For the third distance, L s2 The fourth distance, x s1 For the fifth distance, x s2 This is the sixth distance.

[0082] First target distance x a Based on the principle that the areas of trapezoids are equal, the distance can be determined by the first distance L. a Third distance L s1 Fourth distance L s2 Fifth distance x s1 and the sixth distance x s2 The calculation yields the following expression:

[0083] (x a +x s1 (L) a -L s1 )=(x a +x s2 (L) a -L s2 )-(xs1 +x s2 (L) s1 +L s2 );

[0084] Solve for the distance x of the first target a get:

[0085]

[0086] Second target distance x b Based on the principle that the areas of trapezoids are equal, the second distance L can be used to determine the solution. b Third distance L s1 Fourth distance L s2 Fifth distance x s1 and the sixth distance x s2 The calculation yields the following expression:

[0087] (x b +x s1 (L) b +L s1 )=(x b +x s2 (L) b -L s2 )+(x s1 +x s2 (L) s1 +L s2 );

[0088] Solve for the distance x of the second target b get:

[0089]

[0090] In this way, it is possible to determine whether the rotor 101 rubs against the first bearing 102 in the second direction FX based on the first target distance and whether the rotor 101 rubs against the second bearing 103 in the second direction FX based on the second target distance, and take timely measures to prevent the rotor 101 from rubbing against the first bearing and the second bearing 103 during operation, thus ensuring the safe operation of the centrifugal compressor 100.

[0091] Please see Figure 9 and Figure 10 In some embodiments, the centrifugal compressor 100 includes a third position sensor 106 and a fourth position sensor 107, and the position confirmation method further includes:

[0092] 05. Obtain the seventh and eighth distances between the third and fourth position sensors and the rotor's center of mass in the first direction;

[0093] 06. Detect the ninth distance between the third position sensor and the rotor in the third direction and the tenth distance between the fourth position sensor and the rotor in the third direction, wherein the third direction is perpendicular to the first direction and the second direction, respectively;

[0094] 07. Calculate the third target distance between the first bearing and the rotor in the third direction based on the first distance, the seventh distance, the eighth distance, the ninth distance, and the tenth distance;

[0095] 08. Calculate the fourth target distance between the second bearing and the rotor in the third direction based on the second distance, the seventh distance, the eighth distance, the ninth distance, and the tenth distance.

[0096] Please combine further Figure 2 In some implementations, step 05 can be implemented by the acquisition module 11, step 06 by the detection module 12, step 07 by the first calculation module 13, and step 08 by the second calculation module 14.

[0097] Alternatively, the acquisition module 11 can be used to acquire the seventh and eighth distances between the third position sensor, the fourth position sensor and the centroid of the rotor in the first direction;

[0098] The detection module 12 can be used to detect the ninth distance between the third position sensor and the rotor in the third direction and the tenth distance between the fourth position sensor and the rotor in the third direction, wherein the third direction is perpendicular to the first direction and the second direction, respectively.

[0099] The first calculation module 13 can be used to calculate the third target distance between the first bearing and the rotor in a third direction based on the first distance, the seventh distance, the eighth distance, the ninth distance, and the tenth distance;

[0100] The second calculation module 14 can be used to calculate the fourth target distance between the second bearing and the rotor in a third direction based on the second distance, the seventh distance, the eighth distance, the ninth distance, and the tenth distance.

[0101] Please combine Figure 3In some embodiments, the processor 20 may be used to acquire a seventh distance and an eighth distance between the third position sensor and the fourth position sensor and the centroid of the rotor in a first direction; and to detect a ninth distance between the third position sensor and the rotor in a third direction and a tenth distance between the fourth position sensor and the rotor in a third direction, wherein the third direction is perpendicular to the first direction and the second direction, respectively; the processor 20 may also be used to calculate a third target distance between the first bearing and the rotor in a third direction based on the first distance, the seventh distance, the eighth distance, the ninth distance and the tenth distance, and to calculate a fourth target distance between the second bearing and the rotor in a third direction based on the second distance, the seventh distance, the eighth distance, the ninth distance and the tenth distance.

[0102] Please combine Figure 4 , Figure 5 and Figure 10 It should also be noted that the third direction FY is perpendicular to both the first direction Z and the second direction FX, and the third direction FY can be longitudinal. The first direction Z and the second direction FX can together form a longitudinal detection surface, which is perpendicular to the transverse detection surface.

[0103] The position sensor may also include a third position sensor 106 and a fourth position sensor 107, wherein the third position sensor 106 is located on one side of the first bearing 102 and the fourth position sensor 107 is located on one side of the second bearing 103. The third position sensor 106 and the fourth position sensor 107 are respectively used for displacement data of the rotor 101 in the third direction FY.

[0104] Furthermore, both the third position sensor 106 and the fourth position sensor 107 may include two, with the two third position sensors 106 being symmetrical about the center line of the first bearing 102, and the two fourth position sensors 107 being symmetrically arranged about the center line of the second bearing 103.

[0105] The first bearing 102 and the third position sensor 106 can be adjacent or spaced apart. Similarly, the second bearing 103 and the fourth position sensor 107 can be adjacent or spaced apart. Understandably, if the first bearing 102 and the third position sensor 106 are adjacent, the displacement data detected by the third position sensor 106 can be approximately equal to the actual position of the rotor 101 within the bearing. This can easily lead to a first-order modal frequency lower than the rated speed, significantly increasing the control difficulty of the magnetic levitation bearing. In this embodiment, the example of the first bearing 102 and the third position sensor 106 being spaced apart, and the second bearing 103 and the fourth position sensor 107 being spaced apart, will be used for explanation.

[0106] Since the installation positions of the third position sensor 106 and the fourth position sensor 107 remain unchanged, and the center of mass of the rotor 101 does not change, the seventh distance between the third position sensor 106 and the center of mass of the rotor 101 in the first direction Z and the eighth distance between the fourth position sensor 107 and the center of mass of the rotor 101 in the first direction Z are fixed values ​​that have been determined since the centrifugal compressor 100 was installed. Therefore, the processor 20 can obtain the seventh and eighth distances according to the structural design drawing of the centrifugal compressor 100.

[0107] Furthermore, the seventh distance is equal to the third distance, and the eighth distance is equal to the fourth distance. That is to say, the distance between the first position sensor 104 and the center of mass of the rotor 101 in the first direction Z and the distance between the third position sensor 106 and the center of mass of the rotor 101 in the first direction Z are equal, and the distance between the second position sensor 105 and the center of mass of the rotor 101 in the first direction Z and the distance between the fourth position sensor 107 and the center of mass of the rotor 101 in the first direction Z are equal.

[0108] The ninth distance between the third position sensor 106 and the rotor 101 in the third direction FY can be detected in real time by the third position sensor 106, and the tenth distance between the fourth position sensor 107 and the rotor 101 in the third direction FY can be detected by the fourth position sensor 107. That is to say, the processor 20 can detect the ninth distance through the third position sensor 106 and obtain the tenth distance through the fourth position sensor 107.

[0109] Please combine Figure 10 and Figure 11 A geometric model of the centrifugal compressor 100 is constructed based on the first, second, seventh, eighth, ninth, and tenth distances. In the geometric model, L... a For the first distance, L b For the second distance, L s3 The seventh distance, L s4 The eighth distance, y s1 For the ninth distance, y s2 This is the tenth distance.

[0110] The distance to the third target is y. a Based on the principle that the areas of trapezoids are equal, the distance can be determined by the first distance L. a The seventh distance L s3 , eighth distance L s4 The ninth distance y s1 Distance y from the tenth s2 The calculation yields the following expression:

[0111] (y a +ys1 (L) a -L s3 )=(y a +y s2 (L) a -L s4 )-(y s1 +y s2 (L) s3 +L s4 );

[0112] Solve for the distance y to the third target a get:

[0113]

[0114] The distance to the fourth target is y b Based on the principle that the areas of trapezoids are equal, the second distance L can be used to determine the solution. b The seventh distance L s3 , eighth distance L s4 The ninth distance y s1 Distance y from the tenth s2 The calculation yields the following expression:

[0115] (y b +y s1 (L) b +L s3 )=(y b +y s4 (L) b -L s4 )+(y s1 +y s2 (L) s3 +L s4 );

[0116] Solve for the distance y of the fourth target b get:

[0117]

[0118] In this way, it can be determined whether the rotor 101 rubs against the first bearing 102 on the third direction FY based on the third target distance, and whether the rotor 101 rubs against the second bearing 103 on the third direction FY based on the fourth target distance, and timely measures can be taken to prevent the rotor 101 from rubbing against the first bearing 102 and the second bearing 103 during operation, thus ensuring the safe operation of the centrifugal compressor 100.

[0119] Please see Figure 12 In some implementations, the location confirmation method further includes:

[0120] 09. The magnitude and direction of the coil current of the magnetic levitation bearing are controlled according to at least one of the first target position and the third target position.

[0121] Please combine Figure 13 In some embodiments, the position confirmation device 10 may further include a control module 15, and step 09 may be implemented by the control module 15. The control module 15 may be used to control the magnitude and direction of the coil current of the magnetic levitation bearing according to at least one of the first target position and the third target position.

[0122] In some implementations, the processor 20 can be used to control the magnitude and direction of the coil current of the magnetic levitation bearing based on at least one of a first target position and a third target position.

[0123] Understandably, since the first target position represents the distance between the first bearing 102 and the rotor 101 in the second direction FX, and the third target position represents the distance between the first bearing 102 and the rotor 101 in the third direction, if the first target position or the third target position is too small, the rotor 101 and the first bearing 102 will easily come into contact. It is necessary to adjust the balance position of the rotor 101 so that the rotor 101 and the first bearing 102 maintain a certain distance. The balance position of the rotor 101 is determined by controlling the magnitude and direction of the coil current of the magnetic levitation bearing. Therefore, when the first target position or the third target position is too small and the rotor 101 is prone to rubbing against the first bearing 102, the magnitude and direction of the coil current of the magnetic levitation bearing can be controlled to change the balance position of the rotor 101. In this way, the rotor 101 is prevented from rubbing against the first bearing 102 during operation.

[0124] Please see Figure 14 In some implementations, step 03 includes the following sub-steps:

[0125] 091, if the distance to the first target is less than a first distance threshold, control the magnitude and direction of the coil current of the magnetic levitation bearing to make the distance to the first target greater than or equal to the first distance threshold; and / or

[0126] 092, when the distance to the third target is less than the second distance threshold, control the magnitude and direction of the coil current of the magnetic levitation bearing so that the distance to the third target is greater than or equal to the second distance threshold.

[0127] Please combine Figure 13In some embodiments, sub-steps 091-092 can be implemented by control module 15. Control module 15 can be used to control the magnitude and direction of the coil current of the magnetic levitation bearing to make the first target distance greater than or equal to the first distance threshold when the first target distance is less than the first distance threshold, and to control the magnitude and direction of the coil current of the magnetic levitation bearing to make the third target distance greater than or equal to the second distance threshold when the third target distance is less than the second distance threshold.

[0128] In some embodiments, the processor 20 may also be used to control the magnitude and direction of the coil current of the magnetic levitation bearing to make the first target distance greater than or equal to the first distance threshold when the first target distance is less than the first distance threshold, and to control the magnitude and direction of the coil current of the magnetic levitation bearing to make the third target distance greater than or equal to the second distance threshold when the third target distance is less than the second distance threshold.

[0129] The first and second distance thresholds can be 5 mm, 6 mm, 7 mm, 8 mm, 10 mm, 15 mm, or 20 mm or even larger. For example, in some examples, the first and second distance thresholds can be 10 mm. That is, when the first target distance is less than 10 mm, the magnitude and direction of the coil current of the magnetic levitation bearing are controlled to make the first target distance greater than or equal to 10 mm. When the third target distance is less than 10 mm, the magnitude and direction of the coil current of the magnetic levitation bearing are controlled to make the third target distance greater than or equal to 10 mm.

[0130] This avoids the rotor 101 rubbing against the first bearing 102 during operation, thus ensuring the safety of the first bearing 102.

[0131] Please see Figure 15 In some implementations, the location confirmation method further includes:

[0132] 101. The magnitude and direction of the coil current of the magnetic levitation bearing are controlled according to at least one of the second target position and the fourth target position.

[0133] Please combine further Figure 13 In some embodiments, step 101 can be implemented by control module 15. Control module 15 can be used to control the magnitude and direction of the coil current of the magnetic levitation bearing according to at least one of the second target position and the fourth target position.

[0134] In some implementations, the processor 20 may be used to control the magnitude and direction of the coil current of the second bearing based on at least one of the second target position and the fourth target position.

[0135] Understandably, since the second target position represents the distance between the second bearing 103 and the rotor 101 in the second direction FX, and the fourth target position represents the distance between the second bearing 103 and the rotor 101 in the third direction FY, if the second target position or the fourth target position is too small, the rotor 101 and the second bearing 103 will easily come into contact. It is necessary to adjust the balance position of the rotor 101 so that the rotor 101 and the second bearing 103 maintain a certain distance. The balance position of the rotor 101 is determined by controlling the magnitude and direction of the coil current of the magnetic levitation bearing. Therefore, when the second target position or the fourth target position is too small and the rotor 101 is prone to rubbing against the fourth bearing, the magnitude and direction of the coil current of the magnetic levitation bearing can be controlled to change the balance position of the rotor 101. In this way, the rotor 101 is prevented from rubbing against the second bearing 103 during operation, thus ensuring the safety of the centrifugal compressor 100.

[0136] Please see Figure 16 In some implementations, step 03 includes the following sub-steps:

[0137] 1011, if the distance to the second target is less than the third distance threshold, control the magnitude and direction of the coil current of the magnetic levitation bearing to make the distance to the second target greater than or equal to the third distance threshold; and / or

[0138] 1012, when the distance to the fourth target is less than the fourth distance threshold, control the magnitude and direction of the coil current of the magnetic levitation bearing so that the distance to the fourth target is greater than or equal to the fourth distance threshold.

[0139] In some implementations, sub-steps 1011-1012 may be implemented by control module 15. Control module 15 may be used to control the magnitude and direction of the coil current of the magnetic levitation bearing to make the second target distance greater than or equal to the third distance threshold when the second target distance is less than the third distance threshold, and to control the magnitude and direction of the coil current of the magnetic levitation bearing to make the fourth target distance greater than or equal to the fourth distance threshold when the fourth target distance is less than the fourth distance threshold.

[0140] In some embodiments, the processor 20 may also be used to control the magnitude and direction of the coil current of the magnetic levitation bearing to make the second target distance greater than or equal to the third distance threshold when the second target distance is less than the third distance threshold, and to control the magnitude and direction of the coil current of the magnetic levitation bearing to make the fourth target distance greater than or equal to the fourth distance threshold when the fourth target distance is less than the fourth distance threshold.

[0141] The third and fourth distance thresholds can be 5 mm, 6 mm, 7 mm, 8 mm, 10 mm, 15 mm, or 20 mm or even larger. For example, in some examples, the third and fourth distance thresholds can be 10 mm. That is, when the second target distance is less than 10 mm, the magnitude and direction of the coil current of the magnetic levitation bearing are controlled to make the second target distance greater than or equal to 10 mm. When the fourth target distance is less than 10 mm, the magnitude and direction of the coil current of the magnetic levitation bearing are controlled to make the fourth target distance greater than or equal to 10 mm.

[0142] This avoids the rotor 101 rubbing against the second bearing 103, ensuring the safety of the second bearing 103.

[0143] This application also provides a non-volatile computer-readable storage medium storing a computer program that, when executed by the processor, implements the rotor 101 position confirmation method of any of the above embodiments.

[0144] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific 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 illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0145] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A method of position confirmation of a rotor for a centrifugal compressor, characterized by, The centrifugal compressor includes a rotor, a first bearing, a second bearing, a first position sensor, and a second position sensor. The rotor passes through the first bearing and the second bearing. The first position sensor is located on one side of the first bearing, and the second position sensor is located on one side of the second bearing. The position confirmation method includes: Obtain the first distance, second distance, third distance, and fourth distance between the first bearing, the second bearing, the first position sensor, the second position sensor, and the centroid of the rotor in a first direction; The fifth distance between the first position sensor and the rotor in the second direction and the sixth distance between the second position sensor and the rotor in the second direction are detected, wherein the first direction is perpendicular to the second direction; The first target distance between the first bearing and the rotor in the second direction is calculated based on the first distance, the third distance, the fourth distance, the fifth distance, and the sixth distance. The second target distance between the second bearing and the rotor in the second direction is calculated based on the second distance, the third distance, the fourth distance, the fifth distance, and the sixth distance.

2. The position verification method according to claim 1, characterized by, The centrifugal compressor further includes a third position sensor and a fourth position sensor, and the position confirmation method further includes: Obtain the seventh and eighth distances between the third position sensor, the fourth position sensor, and the centroid of the rotor in the first direction; The ninth distance between the third position sensor and the rotor in a third direction and the tenth distance between the fourth position sensor and the rotor in a third direction are detected, wherein the third direction is perpendicular to the first direction and the second direction, respectively; Calculate the third target distance between the first bearing and the rotor in a third direction based on the first distance, the seventh distance, the eighth distance, the ninth distance, and the tenth distance; The fourth target distance between the second bearing and the rotor in a third direction is calculated based on the second distance, the seventh distance, the eighth distance, the ninth distance, and the tenth distance.

3. The position verification method according to claim 2, characterized by, The seventh distance is equal to the third distance, and the eighth distance is equal to the fourth distance.

4. The position verification method according to claim 2, characterized by, The centrifugal compressor also includes a magnetic levitation bearing, and the position confirmation method further includes: The magnitude and direction of the coil current of the magnetic levitation bearing are controlled based on at least one of the first target distance and the third target distance.

5. The position verification method according to claim 4, characterized by, The step of controlling the magnitude and direction of the coil current of the magnetic levitation bearing based on at least one of the first target distance and the third target distance includes: If the first target distance is less than the first distance threshold, the magnitude and direction of the coil current of the magnetic levitation bearing are controlled to make the first target distance greater than or equal to the first distance threshold; If the distance to the third target is less than the second distance threshold, the magnitude and direction of the coil current of the magnetic levitation bearing are controlled so that the distance to the third target is greater than or equal to the second distance threshold.

6. The position verification method according to claim 2, characterized by, The centrifugal compressor also includes a magnetic levitation bearing, and the position confirmation method further includes: The magnitude and direction of the coil current of the magnetic levitation bearing are controlled based on at least one of the second target distance and the fourth target distance.

7. The position verification method according to claim 6, characterized by, The step of controlling the magnitude and direction of the coil current of the magnetic levitation bearing based on at least one of the second target distance and the fourth target distance includes: If the second target distance is less than the third distance threshold, the magnitude and direction of the coil current of the magnetic levitation bearing are controlled to make the second target distance greater than or equal to the third distance threshold; If the distance to the fourth target is less than the fourth distance threshold, the magnitude and direction of the coil current of the magnetic levitation bearing are controlled so that the distance to the fourth target is greater than or equal to the fourth distance threshold.

8. A position confirmation device of a rotor for a centrifugal compressor, characterized by comprising: The centrifugal compressor includes a rotor, a first bearing, a second bearing, a first position sensor, and a second position sensor. The rotor passes through the first bearing and the second bearing. The first position sensor is located on one side of the first bearing, and the second position sensor is located on one side of the second bearing. The position confirmation device includes: The acquisition module is used to acquire the first distance, second distance, third distance and fourth distance between the first bearing, the second bearing, the first position sensor and the second position sensor and the center of mass of the rotor in a first direction; A detection module is used to detect the fifth distance between the first position sensor and the rotor in a second direction and the sixth distance between the second position sensor and the rotor in a second direction, wherein the first direction is perpendicular to the second direction; The first calculation module is used to calculate the first target distance between the first bearing and the rotor in the second direction based on the first distance, the third distance, the fourth distance, the fifth distance, and the sixth distance; The second calculation module is used to calculate the second target distance between the second bearing and the rotor in the second direction based on the second distance, the third distance, the fourth distance, the fifth distance and the sixth distance.

9. A centrifugal compressor characterized by, It includes a processor and a memory, the memory storing a computer program that, when executed by the processor, causes the processor to implement the location confirmation method according to any one of claims 1-7.

10. A non-transitory computer readable storage medium embodying a computer program, wherein, When the computer program is executed by a processor, the processor implements the location confirmation method according to any one of claims 1-7.

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