Air suspension compressor structure, compressor and running state detection method of compressor

Abstract

The invention relates to an air suspension compressor structure, a compressor and a running state detection method of the compressor, the air suspension compressor structure comprises a motor shell, an air bearing, a rotating shaft and a first position sensor, the air bearing is fixedly arranged in the motor shell, and the rotating shaft is arranged in the air bearing in a penetrating mode; the first position sensor is installed on the air bearing and arranged outside the rotating shaft in a surrounding mode, the first position sensor is annular, the first position sensor and the air bearing are coaxially arranged, and the first position sensor is used for detecting the radial position value of the rotating shaft relative to the air bearing. According to the air suspension compressor structure, by arranging the first position sensor, the radial position value of the rotating shaft relative to the air bearing can be accurately detected, and then whether the rotating shaft floats normally or not is judged.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular, to an air suspension compressor structure, a compressor and a method for detecting the operating state thereof. Background Art

[0002] An air suspension centrifuge compressor is a form of compressor in which the support bearing uses an air suspension bearing. During the rotation of the rotating shaft, an air film will be formed in the cavity between the shaft and the bearing, and the shaft and the bearing are separated to achieve frictionless rotation. Due to its simple structure, high reliability and other characteristics, air suspension bearings are becoming more and more widely used in small power and high-speed application scenarios.

[0003] The air suspension bearing belongs to a special scenario of sliding bearings, and the lubricating and cooling medium in the refrigeration centrifuge is refrigerant gas. Since the viscosity of the refrigerant gas is relatively low, the gap between the bearing and the shaft needs to be very small to provide sufficient supporting force for the rotor. At present, whether the rotating shaft in the air suspension bearing floats normally is a prerequisite for the operation of the entire bearing. At present, there is no relatively perfect detection and judgment method in the industry to determine the position of the rotor. The operating state of the compressor depends entirely on the experience of the user. The diagnosis of the compressor bearing failure is relatively rough, and it is often impossible to give an early warning and protection to the bearing failure in a timely and effective manner. Summary of the Invention

[0004] The object of the present invention is to at least solve the problem that the suspension state of the rotating shaft in the air suspension bearing cannot be accurately detected and judged. This object is achieved by the following means:

[0005] The first aspect of the present invention provides an air suspension compressor structure, which includes a motor housing, an air suspension bearing, a rotating shaft and a first position sensor. The air suspension bearing is fixedly arranged inside the motor housing. The rotating shaft passes through the air suspension bearing. The first position sensor is installed on the air suspension bearing and is arranged annularly on the radial outside of the rotating shaft, and the first position sensor is annular and coaxially arranged with the air suspension bearing. The first position sensor is used to detect the radial position value of the rotating shaft relative to the air suspension bearing.

[0006] According to the air suspension compressor structure of the present invention, by setting the first position sensor, the radial position value of the rotating shaft relative to the air suspension bearing can be accurately detected, and then it can be judged whether the rotating shaft floats normally. It provides an accurate basis for the monitoring of the operating state of the compressor and no longer depends on the experience judgment of the user. Once the rotating shaft has an abnormality, an early warning can be sent in time according to the data fed back by the first position sensor, and corresponding protection measures can be taken to avoid damage to the compressor caused by bearing failure, greatly improving the reliability and safety of the compressor operation.

[0007] In addition, according to the structure of the air suspension compressor of the present invention, the following additional technical features may also be included:

[0008] In some embodiments of the present invention, the air floating bearing includes a first air floating bearing and a second air floating bearing that are axially spaced along the rotation shaft. Along the axial direction of the rotation shaft, the rotation shaft includes a first support section, a main body section, and a second support section that are connected in sequence. The first support section passes through the first air floating bearing, and the second support section passes through the second air floating bearing; the first position sensor is installed on the first air floating bearing, and the first position sensor is used to detect the radial position value of the first support section relative to the first air floating bearing.

[0009] In some embodiments of the present invention, the air suspension compressor structure further includes an axial target disk. The axial target disk is fixedly sleeved on the rotation shaft, and along the axial direction, a part of the axial target disk is disposed opposite to the first position sensor. The first position sensor can detect the axial position value of the rotation shaft relative to the first air floating bearing through the axial target disk.

[0010] In some embodiments of the present invention, the air suspension compressor structure further includes a limiting component and a thrust disk. The limiting component is installed in the motor housing. The limiting component defines a limiting gap extending radially along the rotation shaft. The thrust disk is fixedly sleeved on the rotation shaft, and at least a part of the thrust disk is located in the limiting gap; wherein, along the axial direction, the axial target disk is disposed between the first position sensor and the thrust disk.

[0011] In some embodiments of the present invention, the limiting component includes: a first support, fixed in the motor housing and surrounding the rotation shaft; a second support, fixed in the motor housing and surrounding the rotation shaft, and along the axial direction, a limiting gap is defined between the first support and the second support; a first thrust bearing, disposed in the limiting gap and installed on the first support; a second thrust bearing, disposed in the limiting gap and installed on the second support. The second thrust bearing and the first thrust bearing are axially spaced, and the thrust disk is located between the first thrust bearing and the second thrust bearing.

[0012] In some embodiments of the present invention, along the axial direction, a first assembly groove is provided at one end of the first support facing away from the second support, and the first air floating bearing is installed in the first assembly groove.

[0013] In some embodiments of the present invention, along the axial direction, a first installation groove is provided at one end of the first air floating bearing facing away from the second air floating bearing, and the first position sensor is installed in the first installation groove.

[0014] In some embodiments of the present invention, the air suspension compressor structure further includes a second position sensor, which is installed on the second air bearing, and the second position sensor is used to detect the radial position value of the second support section relative to the second air bearing.

[0015] According to a second aspect of the present invention, a compressor is further provided. The compressor includes the air suspension compressor structure as described in the first aspect. The compressor further includes a control device, which is electrically connected to the first position sensor, and the control device is used to judge and output the suspension state of the rotating shaft according to the radial position value.

[0016] According to a third aspect of the present invention, a method for detecting the operating state of a compressor is further provided. The compressor is the compressor as described in claim 9. The method for detecting the operating state of the compressor includes: when the compressor is in the closed state, obtaining a first initial radial position value of the rotating shaft measured by the first position sensor; when the compressor is in the operating state, obtaining a first real-time radial position value of the rotating shaft measured by the first position sensor; calculating a first difference between the first initial radial position value and the first real-time radial position value; judging that the rotating shaft is in a normal suspension state according to the first difference being greater than or equal to a first preset value, and judging that the rotating shaft is not floating normally according to the first difference being less than the first preset value.

[0017] In some embodiments of the present invention, before the step of calculating the first difference between the first initial radial position value and the first real-time radial position value, the method for detecting the operating state of the compressor further includes the following steps: judging whether the first initial radial position value is greater than a second preset value; judging that the rotating shaft has a wear fault according to the first initial radial position value being greater than the second preset value; and performing the step of calculating the first difference between the first initial radial position value and the first real-time radial position value according to the first initial radial position value being less than or equal to the second preset value.

[0018] In some embodiments of the present invention, the method for detecting the operating state of the compressor further includes: when the compressor is in the closed state, obtaining an initial axial position value of the rotating shaft measured by the first position sensor; when the compressor is in the operating state, obtaining a real-time axial position value of the rotating shaft measured by the first position sensor; calculating an axial difference between the initial axial position value and the real-time axial position value; judging that the rotating shaft is in a normal suspension state according to the axial difference being less than or equal to a third preset value, and judging that the rotating shaft is not floating normally according to the axial difference being greater than the third preset value.

[0019] In some embodiments of the present invention, the method for detecting the operating state of the compressor further includes: when the compressor is in the closed state, obtaining the second initial radial position value of the rotating shaft measured by the second position sensor; when the compressor is in the operating state, obtaining the second real-time radial position value of the rotating shaft measured by the second position sensor; calculating a second difference by subtracting the second real-time radial position value from the second initial radial position value; determining that the rotating shaft is in a normal suspension state if both the first difference and the second difference are greater than or equal to a first preset value, and determining that the rotating shaft is not floating normally if any one of the first difference and the second difference is less than the first preset value.

[0020] In some embodiments of the present invention, the method for detecting the operating state of the compressor further includes: retrieving the real-time radial position value record of the rotating shaft measured by the first position sensor when the compressor was in the previous operating state; calculating the average value of the real-time radial position values in the real-time radial position value record; calculating a change rate value between the average value of the real-time radial position values and the first real-time radial position value; determining that the rotating shaft is in a normal suspension state if the change rate value is less than or equal to a preset change rate, and determining that the rotating shaft is not floating normally if the change rate value is greater than the preset change rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention. Moreover, throughout the drawings, the same reference numerals are used to denote the same components. Among them:

[0022] Figure 1 is a schematic cross-sectional structure diagram of the air suspension compressor structure according to an embodiment of the present invention;

[0023] Figure 2 is a schematic block diagram showing the control device according to an embodiment of the present invention being electrically connected to the first position sensor and the second position sensor respectively;

[0024] Figure 3 is a flowchart of the method for detecting the operating state according to an embodiment of the present invention;

[0025] Figure 4 is a flowchart of the method for detecting the operating state according to another embodiment of the present invention;

[0026] Figure 5 is a flowchart of the method for detecting the operating state according to still another embodiment of the present invention;

[0027] Figure 6The flowchart of the operating state detection method for another embodiment of the present invention;

[0028] Figure 7 The flowchart of the operating state detection method for an exemplary embodiment of the present invention.

[0029] The reference numerals in the drawings are represented as follows:

[0030] 100, air suspension compressor structure;

[0031] 11, motor housing; 12, first air bearing; 121, first mounting groove; 13, second air bearing;

[0032] 20, rotating shaft; 21, first support section; 22, main body section; 23, second support section;

[0033] 31, first position sensor; 32, second position sensor; 33, axial target disk;

[0034] 40, limiting assembly; 401, limiting gap; 41, first support; 411, first assembly groove; 42, second support; 43, first thrust bearing; 44, second thrust bearing;

[0035] 51, thrust disk; 52, first volute; 53, second volute; 54, first impeller; 55, second impeller;

[0036] 60, control device; 61, memory; 62, processor. Detailed implementation manners

[0037] The exemplary embodiments of the present invention will be described in more detail below with reference to the drawings. Although the exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0038] It should be understood that the terms used herein are for the purpose of describing particular example embodiments only and are not intended to be limiting. Unless the context clearly dictates otherwise, the singular forms "a", "an", and "the" as used herein may also include the plural forms. The terms "comprising", "including", "containing", and "having" are inclusive and thus specify the presence of the stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the particular order described or illustrated, unless the order of performance is explicitly stated. It should also be understood that additional or alternative steps may be used.

[0039] Although the terms first, second, third, etc. may be used herein to describe multiple elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or section from another. Unless the context clearly dictates otherwise, terms such as "first", "second", and other numerical terms when used herein do not imply an order or sequence. Thus, the first element, component, region, layer, or section discussed below may be referred to as the second element, component, region, layer, or section without departing from the teachings of the example embodiments.

[0040] In this application, unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled", "fixed", etc. shall be construed broadly. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or capable of communicating with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention may be understood according to specific circumstances.

[0041] For ease of description, spatial relative relationship terms may be used in the text to describe the relationship of one element or feature shown in the figure with respect to another element or feature. These relative relationship terms are, for example, "inner", "outer", "inner side", "outer side", "below", "beneath", "above", "over", etc. Such spatial relative relationship terms are intended to include different orientations of the device in use or operation other than the orientations depicted in the figure. For example, if the device in the figure rotates, then an element described as "below" or "beneath" other elements or features will subsequently be oriented as "above" or "over" other elements or features. Thus, the exemplary term "below" can include both upper and lower orientations.

[0042] As Figure 1 shown, according to an embodiment of the present invention, a structure 100 of an air suspension compressor is provided. The structure 100 of the air suspension compressor includes a motor housing 11, an air floating bearing, a rotating shaft 20, and a first position sensor 31. The motor housing 11 serves as an external protection component of the entire structure 100 of the air suspension compressor, providing an installation space and protection for the internal air floating bearing, rotating shaft 20, first position sensor 31, etc. The air floating bearing is fixedly installed inside the motor housing 11 and is a component for supporting the rotation of the rotating shaft 20. The rotating shaft 20 passes through the air floating bearing. During the rotation of the rotating shaft 20, an air film is formed in the cavity between the rotating shaft 20 and the bearing, separating the rotating shaft 20 from the bearing, and thus enabling the rotating shaft 20 to be suspended inside the air floating bearing, realizing frictionless rotation between the rotating shaft 20 and the air floating bearing. The first position sensor 31 is installed on the air floating bearing and is disposed around the rotating shaft 20, being annular and coaxially arranged with the air floating bearing. The main function of the first position sensor 31 is to detect the radial position value of the rotating shaft 20 relative to the air floating bearing.

[0043] Specifically, when the air suspension compressor starts, the rotating shaft 20 begins to rotate inside the air floating bearing. During the rotation of the rotating shaft 20, the air floating bearing forms an air film in the cavity between the shaft and the bearing, separating the rotating shaft 20 from the bearing and realizing frictionless rotation. At the same time, the first position sensor 31 continuously monitors the radial position value of the rotating shaft 20 relative to the air floating bearing. By analyzing the radial position value, it can be determined whether the rotating shaft 20 floats normally during operation. If the rotating shaft 20 floats normally, the radial position value of the rotating shaft 20 will fluctuate within a reasonable range; if the value exceeds the normal range, it indicates that the rotating shaft 20 may be abnormal, such as not floating normally or having eccentricity, etc.

[0044] In this embodiment, by setting the first position sensor 31, the radial position value of the rotating shaft 20 relative to the air bearing can be accurately detected, and then it can be determined whether the rotating shaft 20 floats normally. This provides an accurate basis for monitoring the operating state of the compressor and no longer relies on the experience judgment of the user. Once an abnormality occurs in the rotating shaft 20, an early warning can be issued in a timely manner according to the data fed back by the first position sensor 31, and corresponding protective measures can be taken to avoid damage to the compressor caused by bearing failure, greatly improving the reliability and safety of the compressor operation.

[0045] Among them, the first position sensor 31 is an eddy current sensor. The first position sensor 31 includes a housing and at least one detection probe provided on the housing. The housing is in a ring structure and is sleeved outside the rotating shaft 20. When the rotating shaft 20 floats normally, there is no contact between the rotating shaft 20 and the first position sensor 31. The ring structure of the housing enables it to be closely sleeved outside the rotating shaft 20, realizing the full-round monitoring of the position of the rotating shaft 20 without affecting the normal operation of the rotating shaft 20, and also providing a stable installation foundation for the detection probe to ensure the stability and accuracy of the detection probe during the detection process.

[0046] The first position sensor 31 is coaxially arranged with the air bearing, that is, the first position sensor 31 and the air bearing share the same axis. At least part of the detection probes are arranged along the radial direction of the rotating shaft 20 and generate induction with the rotating shaft 20 by using the eddy current effect, so as to detect the relative position data in the radial direction between the rotating shaft 20 and the detection probe. At least part of the detection probes are arranged along the radial direction of the rotating shaft 20, and the purpose is to accurately detect the position change of the rotating shaft 20 in the radial direction. Different numbers and layouts of detection probes can be flexibly configured according to the actual detection accuracy requirements and application scenarios. For example, when extremely high detection accuracy is required, the number of detection probes can be increased and a denser and more uniform distribution method can be adopted to obtain more comprehensive and accurate position information of the rotating shaft 20.

[0047] Among them, when an alternating current passes through the detection probe, an alternating magnetic field will be generated around it. When the rotating shaft 20 is within the range of action of this alternating magnetic field, an induced current, that is, eddy current, will be generated on the surface of the rotating shaft 20. This eddy current will generate its own alternating magnetic field, and this magnetic field interacts with the alternating magnetic field of the detection probe, thereby changing the impedance of the detection probe. The impedance change of the detection probe is closely related to the distance between the rotating shaft 20 and the detection probe. By measuring the impedance change of the detection probe, the relative position data in the radial direction between the rotating shaft 20 and the detection probe can be calculated. Since the first position sensor 31 is coaxially arranged with the air bearing, therefore, the relative position data between the axis of the rotating shaft 20 and the axis of the first position sensor 31 in the radial direction calculated according to the relative position data between the rotating shaft 20 and the detection probe is the radial position value of the rotating shaft 20 relative to the air bearing.

[0048] Specifically, the numerical value of the radial position of the rotating shaft 20 relative to the air bearing refers to the distance between the axis of the rotating shaft 20 and the axis of the air bearing along the radial direction of the rotating shaft 20.

[0049] It should be noted that the coaxial setting of the first position sensor 31 and the air bearing ensures that the position data detected by the first position sensor 31 is directly related to the air bearing. By obtaining the relative position data between the rotating shaft 20 and the detection probe through the detection probe, the numerical value of the radial position of the rotating shaft 20 relative to the air bearing can be directly and accurately reflected. If they are not coaxial, the detection data may be interfered by other factors, resulting in inaccurate calculation of the position of the rotating shaft 20 relative to the air bearing, thereby affecting the judgment of the operating state of the compressor. The coaxial setting also makes the data processing process simpler and more direct. When calculating the numerical value of the radial position of the rotating shaft 20 relative to the air bearing, there is no need to perform complex coordinate transformation or correction, reducing the workload and error sources of data processing. By directly calculating based on the data obtained by the detection probe, the accurate position information of the rotating shaft 20 can be quickly obtained, improving the response speed and real-time performance of the monitoring system.

[0050] In some embodiments, the air bearing includes a first air bearing 12 and a second air bearing 13 that are axially spaced along the rotating shaft 20. Axially along the rotating shaft 20, the rotating shaft 20 includes a first support section 21, a main body section 22, and a second support section 23 that are sequentially connected. The first support section 21 is inserted into the first air bearing 12, and the second support section 23 is inserted into the second air bearing 13. The first air bearing 12 and the second air bearing 13 provide stable support for the rotating shaft 20. The first position sensor 31 is installed on the first air bearing 12, and the first position sensor 31 is used to detect the radial position value of the first support section 21 relative to the first air bearing 12. When the air suspension compressor operates, the rotating shaft 20 rotates under the support of the first air bearing 12 and the second air bearing 13. The first air bearing 12 and the second air bearing 13 respectively form air films between the first support section 21 and the bearing, and the second support section 23 and the bearing, realizing frictionless rotation. The detection probe of the first position sensor 31 works based on the eddy current effect. When an alternating current is passed through the detection probe to generate an alternating magnetic field, the first support section 21 generates eddy currents under the action of this magnetic field. The magnetic field generated by the eddy currents interacts with the magnetic field of the detection probe to change its impedance. By measuring the impedance change, the relative position data between the first support section 21 and the detection probe is calculated, and then the radial position value of the first support section 21 relative to the first air bearing 12 is obtained, so as to judge the operating state of the rotating shaft 20. Installing the first position sensor 31 on the first air bearing 12 to detect the position of the first support section 21 can more specifically obtain the operating state information of one end of the rotating shaft 20. By monitoring the radial position value of the first support section 21 relative to the first air bearing 12, it is possible to timely detect whether there are abnormalities at this end of the rotating shaft 20, such as eccentricity, failure to float up normally, etc., providing a reliable guarantee for the stable operation of the compressor. In this embodiment, two air bearings are used to axially support the rotating shaft 20 at intervals. Compared with a single air bearing, it can better withstand various forces generated when the rotating shaft 20 rotates at high speed, reduce the shaking and offset of the rotating shaft 20, and improve the operating stability of the entire compressor.

[0051] In some embodiments, the air suspension compressor structure 100 further includes an axial target disk 33. The axial target disk 33 has a disk-like structure and is provided with a through hole so that the axial target disk 33 can be sleeved and fixed outside the rotating shaft 20. Axially, part of the axial target disk 33 is disposed opposite to the first position sensor 31. The first position sensor 31 has a plurality of detection probes, and part of the detection probes among the plurality of detection probes are arranged in the axial direction and are opposite to the axial target disk 33. When the air suspension compressor operates, the rotating shaft 20 drives the axial target disk 33 to rotate synchronously. The detection probes of the first position sensor 31 generate an alternating magnetic field through an alternating current. Since part of the axial target disk 33 is disposed opposite to the first position sensor 31, an eddy current is generated on the surface of the axial target disk 33 under the action of the alternating magnetic field. The magnetic field generated by the eddy current interacts with the magnetic field of the detection probe, changing the impedance of the detection probe. By measuring the change in the impedance of the detection probe, the relative position data along the axial direction between the axial target disk 33 and the detection probe is calculated, and then the axial position value of the rotating shaft 20 relative to the first air bearing 12 is obtained. Combining the previously detected radial position value, the operating state of the rotating shaft 20 can be more comprehensively grasped.

[0052] In this embodiment, based on the original radial position monitoring, axial position monitoring is added, making the monitoring of the operating state of the rotating shaft 20 more comprehensive. Abnormal conditions such as displacement and coking of the rotating shaft 20 in the axial direction can be detected in a timely manner, providing more reliable data support for the stable operation of the compressor. By monitoring the axial position value of the rotating shaft 20, potential hazards that may cause compressor failures can be detected in advance, such as excessive axial displacement of the rotating shaft 20 caused by unbalanced axial forces. Timely warning and taking measures can avoid the expansion of the failure and reduce the risk of equipment damage. Accurately grasping the axial position information of the rotating shaft 20 helps to optimize and adjust the operating parameters of the compressor, such as adjusting the air supply pressure of the air bearing, to balance the axial force, enabling the compressor to operate in a more stable and efficient state, improving the overall performance and service life of the equipment.

[0053] In some embodiments, the air suspension compressor structure 100 further includes a limit assembly 40 and a thrust disk 51. The limit assembly 40 is installed in the motor housing 11. The limit assembly 40 defines a limit gap 401 extending radially along the rotating shaft 20. The thrust disk 51 is fixedly sleeved on the rotating shaft 20, and at least a part of the thrust disk 51 is located in the limit gap 401. The thrust disk 51 is used to bear the thrust of the rotating shaft 20 in the axial direction. By cooperating with the limit assembly 40, the axial movement of the rotating shaft 20 is restricted, ensuring the stable operation of the compressor. Axially, an axial target disk 33 is arranged between the first position sensor 31 and the thrust disk 51. In this embodiment, the axial target disk 33 is arranged between the first position sensor 31 and the thrust disk 51. This layout neither affects the normal operation of the thrust disk 51 and the limit assembly 40, nor enables the first position sensor 31 to more accurately detect the axial position of the rotating shaft 20, while not interfering with the operation of other components, making the entire detection and stability structure more reasonable.

[0054] In some embodiments, the limit assembly 40 includes a first support 41, a second support 42, a first thrust bearing 43 and a second thrust bearing 44. Both the first support 41 and the second support 42 are in a ring structure. The first support 41 and the second support 42 are respectively fixed in the motor housing 11 and arranged around the outside of the rotating shaft 20, and there is no contact between the first support 41 and the second support 42 and the rotating shaft 20. Axially, a limit gap 401 is defined between the first support 41 and the second support 42. Both the first support 41 and the second support 42 are made of materials with certain strength and stability to ensure the stability of their own structures during the operation of the compressor and will not be displaced or damaged due to factors such as vibration and force. The first thrust bearing 43 is installed on the first support 41 and is located in the limit gap 401, and is used to bear the axial force from one side of the thrust disk 51. Generally, a special bearing structure and material are adopted, which have good wear resistance and load-bearing capacity to adapt to the working environment of high-speed rotation and large axial force. The second thrust bearing 44 is installed on the second support 42 and is axially spaced from the first thrust bearing 43. The second thrust bearing 44 is located in the limit gap 401 and is used to bear the axial force on the other side of the thrust disk 51, and works together with the first thrust bearing 43 to jointly limit the axial displacement of the thrust disk 51 and the rotating shaft 20.

[0055] In this embodiment, the first support 41 and the second support 42 are tightly fixed in the motor housing 11 by a specific installation method (such as bolt connection, welding, etc.). The first thrust bearing 43 and the first support 41, and the second thrust bearing 44 and the second support 42 are respectively stably connected by a suitable installation method (such as interference fit, snap connection, etc.). The thrust disk 51 and the rotating shaft 20 are tightly connected by fixed sleeving to ensure their synchronous rotation.

[0056] Among them, when the air suspension compressor is running, the rotating shaft 20 drives the thrust disk 51 to rotate synchronously. In the axial direction, if the rotating shaft 20 is subjected to an axial force to the left, the thrust disk 51 will squeeze the first thrust bearing 43 to the left. The first thrust bearing 43 transmits the force to the first support 41, and the first support 41 then disperses the force to the motor housing 11, thereby restricting the axial movement of the rotating shaft 20 to the left. If the rotating shaft 20 is subjected to an axial force to the right, the thrust disk 51 squeezes the second thrust bearing 44 to the right, and similarly restricts the axial movement of the rotating shaft 20 to the right. By respectively bearing axial forces in different directions by the first thrust bearing 43 and the second thrust bearing 44, the axial displacement of the rotating shaft 20 can be more precisely controlled. Compared with a single limiting method, the bearing and adjustment capabilities of the axial force are stronger, effectively improving the stability of the rotating shaft 20 in the axial direction.

[0057] Further, along the axial direction, one end of the first support away from the second support is provided with a first assembly groove 411, and the first air bearing 12 is installed in the first assembly groove 411, which can effectively enhance the structural stability of the entire air suspension compressor. Specifically, the first assembly groove 411 provides precise positioning for the first air bearing 12, ensuring that the first air bearing 12 can always stably support the rotating shaft 20, guaranteeing the rotation accuracy of the rotating shaft 20, and further improving the operation stability of the entire compressor, reducing vibrations and noises caused by component loosening or displacement, and reducing the probability of equipment failures.

[0058] The design of the first assembly groove 411 greatly improves the installation convenience of the first air bearing 12. During the installation process, only need to accurately place the first air bearing 12 into the first assembly groove 411, without complex positioning and calibration operations, reducing the installation time and difficulty. Compared with other installation methods, it can guide the installer to complete the installation work quickly and accurately, improving the production efficiency, and at the same time reducing the risk of equipment failures caused by improper installation.

[0059] Further, along the axial direction, one end of the first air bearing 12 away from the second air bearing 13 is provided with a first installation groove 121, and the first position sensor 31 is installed in the first installation groove 121. The first installation groove 121 provides a precise positioning space for the first position sensor 31. When the compressor is running, the precise positioning keeps the relative position relationship between the sensor and the rotating shaft 20 constant, avoiding deviation of the detection data caused by the change of the sensor position, thereby ensuring the accuracy and reliability of the detection data, and providing a reliable basis for judging the operating state of the compressor. Moreover, the installer only needs to accurately place the sensor into the installation groove to complete the preliminary installation, without complex positioning and calibration steps, shortening the installation time, reducing the installation difficulty, and improving the assembly efficiency of the entire air suspension compressor.

[0060] In some embodiments, the air suspension compressor structure 100 further includes a second position sensor 32. The structure of the second position sensor 32 is similar to that of the first sensor. The second position sensor 32 includes a housing and at least one detection probe provided on the housing. The housing has an annular structure and is sleeved outside the rotating shaft 20. When the rotating shaft 20 is normally suspended, there is no contact between the rotating shaft 20 and the second position sensor 32. The annular structure of the housing enables it to be closely sleeved outside the rotating shaft 20, realizing omnidirectional monitoring of the position of the second support section 23 of the rotating shaft 20 without affecting the normal operation of the rotating shaft 20. The housing provides a stable installation basis for the detection probe, ensuring the stability and accuracy of the detection probe during the detection process. The second position sensor 32 is installed on the second air bearing 13 and is fixed to the second air bearing 13 by a specific installation method (such as clamping, bolt connection, etc.) to ensure a tight connection.

[0061] When the air suspension compressor is operating, the second air bearing 13 forms an air film between the second support section 23 and itself to achieve frictionless rotation. The detection probe of the second position sensor 32 generates an alternating magnetic field through an alternating current. An eddy current is generated in the second support section 23 under the action of this magnetic field. The magnetic field generated by the eddy current interacts with the magnetic field of the detection probe to change its impedance. By measuring the change in the impedance of the detection probe, the relative position data between the second support section 23 and the detection probe is calculated, and then the radial position value of the second support section 23 relative to the second air bearing 13 is obtained, so as to judge the operating state of this end of the rotating shaft 20.

[0062] In this embodiment, the first position sensor 31 monitors the radial position value of the first support section 21 relative to the first air bearing 12, and the second position sensor 32 monitors the radial position value of the second support section 23 relative to the second air bearing 13. By monitoring simultaneously from both ends of the rotating shaft 20, the radial position change of the rotating shaft 20 during operation can be comprehensively grasped, and whether there are abnormalities such as eccentricity and bending of the rotating shaft 20 can be detected in time, providing more reliable data support for the stable operation of the compressor.

[0063] In this embodiment, the air suspension compressor structure 100 further includes a first volute 52, a second volute 53, a first impeller 54 and a second impeller 55. The first volute 52 and the second volute 53 are respectively installed at both ends of the motor housing 11 along the axial direction. The first volute 52 has a first cavity communicating with the inner cavity of the motor housing 11. One end of the rotating shaft 20 extends into the first cavity. The first impeller 54 is arranged in the first cavity and is fixedly connected to the rotating shaft 20. The second volute 53 has a second cavity communicating with the inner cavity of the motor housing 11. The other end of the rotating shaft 20 extends into the second cavity. The second impeller 55 is arranged in the second cavity and is fixedly connected to the rotating shaft 20.

[0064] According to an embodiment of the present invention, a compressor is also proposed, such asFigure 1 and Figure 2 As shown in Figure 2 , the compressor includes an air suspension compressor structure 100 and a control device 60. The control device 60 is electrically connected to a first position sensor 31 and a second position sensor 32 respectively. The control device 60 is configured to judge and output the suspension state of the rotating shaft 20 according to the radial position value. Among them, the control device 60 includes a memory 61 and at least one processor 62. The memory 61 stores a program or instruction that can run on the processor 62. When the processor 62 executes the program or instruction, the steps of the operation state detection method of the compressor in the present invention are realized.

[0065] According to an embodiment of the present invention, a method for detecting the operation state of a compressor is also proposed. The method for detecting the operation state of the compressor is implemented by using the compressor. As Figure 3 shown, the method for detecting the operation state of the compressor includes the following steps:

[0066] Step S101: When the compressor is in the closed state, obtain the first initial radial position value of the rotating shaft measured by the first position sensor;

[0067] Step S102: When the compressor is in the operating state, obtain the first real-time radial position value of the rotating shaft measured by the first position sensor;

[0068] Step S103: Calculate the first difference between the first initial radial position value and the first real-time radial position value;

[0069] Step S104: Determine that the rotating shaft is in the normal suspension state according to the first difference being greater than or equal to the first preset value, and determine that the rotating shaft is not floating normally according to the first difference being less than the first preset value.

[0070] In step S101, when the compressor is in the closed state, the first position sensor detects and records the radial position value of the rotating shaft at this time, that is, the first initial radial position value. This value serves as the basic data for subsequent judgment and represents the relative position of the rotating shaft of the compressor in the static state. Since the compressor is not operating at this time, the rotating shaft is not affected by various forces caused by rotation. Under the action of gravity, the rotating shaft is located at the lowest position of the inner ring of the air floating bearing, and the rotating shaft is in contact with the air floating bearing. In the closed state, the obtained initial value is relatively stable and accurate, providing a reliable reference for the comparison in the subsequent operating state.

[0071] In step S102, after the compressor starts and is in the running state, the first position sensor continuously works, monitors the change in the radial position of the rotating shaft in real time, and measures the radial position value at this time, that is, the first real-time radial position value. During operation, the rotating shaft rotates at high speed under the support of the aerostatic bearing. Affected by various factors such as air film pressure and rotational centrifugal force, its radial position will change dynamically. This value reflects the actual position state of the rotating shaft during operation.

[0072] In step S103, subtract the first real-time radial position value from the first initial radial position value to obtain a first difference. This difference can intuitively reflect the change in the radial position of the rotating shaft from the stationary state to the running state. By calculating the difference, the position data in different states are quantitatively compared, providing a measurable index for subsequent judgment.

[0073] In step S104, a first preset value is preset in advance. The first preset value is comprehensively determined based on various factors such as the design parameters of the compressor, the performance of the aerostatic bearing, and the operating requirements of the rotating shaft. When the first difference is greater than or equal to the first preset value, it indicates that the position change of the rotating shaft during operation is within a reasonable range, and the aerostatic bearing can effectively support the rotating shaft and keep it in a normal suspended state; if the first difference is less than the first preset value, it indicates that the position change of the rotating shaft is abnormal, which may be due to unstable air film formation of the aerostatic bearing or other factors affecting the normal suspension of the rotating shaft, thus determining that the rotating shaft is not floating normally.

[0074] In this embodiment, by obtaining the radial position value of the rotating shaft in real time and conducting comparative analysis, it is possible to timely detect whether the rotating shaft is floating normally, quickly capture potential fault hazards during the operation of the compressor, and provide guarantee for the safe and stable operation of the equipment. Compared with the traditional method relying on manual experience judgment, it is more accurate and efficient, greatly improving the timeliness and reliability of monitoring. Accurately judging the suspension state of the rotating shaft helps to take timely measures to avoid equipment damage caused by the abnormal floating of the rotating shaft. The detection method can provide quantitative data support for the operating state of the compressor, helping the operator understand the operating conditions of the equipment, and then optimize and adjust the operating parameters of the equipment. For example, adjust parameters such as the air supply pressure of the aerostatic bearing according to the suspension state of the rotating shaft, so that the compressor is always in the best operating state, improving work efficiency and performance.

[0075] In some embodiments, as Figure 4 shown, the method for detecting the operating state of the compressor includes the following steps:

[0076] Step S201: When the compressor is in the closed state, obtain the first initial radial position value of the rotating shaft measured by the first position sensor;

[0077] Step S202: When the compressor is in the operating state, obtain the first real-time radial position value of the rotating shaft measured by the first position sensor;

[0078] Step S203: Determine whether the first initial radial position value is greater than the second preset value. If so, execute Step S204; if not, execute Step S205;

[0079] Step S204: Determine that the rotating shaft has a wear fault based on the fact that the first initial radial position value is greater than the second preset value;

[0080] Step S205: Calculate the first difference, which is the first initial radial position value minus the first real-time radial position value;

[0081] Step S206: Determine that the rotating shaft is in the normal suspension state if the first difference is greater than or equal to the first preset value, and determine that the rotating shaft has not floated up normally if the first difference is less than the first preset value.

[0082] In this embodiment, Step S201 is the same as Step S101, Step S202 is the same as Step S102, Step S205 is the same as Step S103, and Step S206 is the same as Step S104, which will not be elaborated here.

[0083] In Step S203, compare the obtained first initial radial position value with the pre-set second preset value. The second preset value is comprehensively determined based on factors such as the design standard of the compressor, the normal clearance between the air bearing and the rotating shaft, etc. The second preset value is the key reference value for judging whether there is a wear fault in the rotating shaft. Among them, the second preset value is greater than the first preset value.

[0084] In Step S204, if the first initial radial position value is greater than the second preset value, this indicates that in the static state of the compressor, the radial position of the rotating shaft exceeds the normal range. Generally, this may be due to the long-term use of the rotating shaft, friction with the air bearing or other components, resulting in wear on the surface of the rotating shaft, a decrease in diameter, and thus a change in the radial position. Therefore, based on this judgment, it can be determined that the rotating shaft has a wear fault.

[0085] It can be understood that when the first initial radial position value is less than or equal to the second preset value, it means that the position of the rotating shaft in the static state is within the normal range and there is no obvious wear fault. At this time, proceed to the next calculation, subtract the first real-time radial position value from the first initial radial position value to obtain the first difference. This difference reflects the degree of change in the radial position of the rotating shaft from the static state to the operating state, and is an important basis for judging whether the rotating shaft is normally suspended.

[0086] In this embodiment, by adding a step for judging the wear fault of the rotating shaft and using the comparison between the first initial radial position value and the second preset value, it is possible to timely detect whether there is a wear problem with the rotating shaft, achieving a more comprehensive diagnosis of potential faults of the compressor, avoiding more serious equipment damage caused by neglecting the wear of the rotating shaft, and detecting the wear fault of the rotating shaft in advance. The operator can arrange the maintenance and repair work of the equipment according to the actual situation, timely replace the worn rotating shaft or take corresponding repair measures, which helps to implement the preventive maintenance strategy, avoid sudden failures during equipment operation, reduce downtime, improve production efficiency, and reduce equipment repair costs and production losses caused by equipment failures.

[0087] In some embodiments, as Figure 5 shown, the method for detecting the operating state of the compressor further includes the following steps:

[0088] Step S301: When the compressor is in the closed state, obtain the initial axial position value of the rotating shaft measured by the first position sensor;

[0089] Step S302: When the compressor is in the operating state, obtain the real-time axial position value of the rotating shaft measured by the first position sensor;

[0090] Step S303: Calculate the axial difference between the initial axial position value and the real-time axial position value;

[0091] Step S304: Determine that the rotating shaft is in the normal floating state according to the axial difference being less than or equal to the third preset value, and determine that the rotating shaft is not floating normally according to the axial difference being greater than the third preset value.

[0092] In step S301, when the compressor is in the closed state, in addition to detecting the radial position, the first position sensor also measures the axial position of the rotating shaft. At this time, the rotating shaft is in a static state and is not affected by dynamic factors such as axial force during operation. The value measured by the first position sensor is the initial axial position value. The initial axial position value represents the axial reference position of the rotating shaft in the static state and is an important reference basis for judging the axial state of the rotating shaft during operation, providing the starting data point for the entire axial position detection process.

[0093] In step S302, when the compressor starts and runs, the first position sensor continues to work and continuously monitors the change of the axial position of the rotating shaft. During operation, the rotating shaft is affected by various factors such as the electromagnetic force of the motor and the axial acting force of the air flow, and its axial position will change dynamically. The value measured by the first position sensor at this time is the real-time axial position value, and the real-time axial position value reflects the actual axial position state of the rotating shaft during operation.

[0094] In step S303, the real-time axial position value is subtracted from the initial axial position value to obtain an axial difference. This difference quantifies the degree of change in the axial position of the shaft from the static state to the running state. By calculating the axial difference, the axial position data under different states can be compared, providing an intuitive and measurable indicator for judging the suspension state of the shaft.

[0095] In step S304, a third preset value is set in advance, which is determined comprehensively based on multiple factors such as the design parameters of the compressor, the axial load-bearing capacity of the air-floating bearing, and the operation requirements of the rotating shaft. When the axial difference value is less than or equal to the third preset value, it indicates that the axial position change of the shaft during operation is within a reasonable range, and the axial force can be effectively withstand the axial force between the limiting assembly and the thrust disc to maintain the normal suspension of the shaft. At this time, it can be determined that the shaft is in a normal suspension state; on the contrary, if the axial difference value is greater than the third preset value, it means that the axial position change of the shaft exceeds the normal range, which may be due to the axial support performance problem between the limiting assembly and the thrust disc, or other interference factors cause the axial force imbalance, and it is determined that the shaft has not floated normally.

[0096] In this embodiment, based on the existing radial position detection, a new step of detecting the axial position of the rotating shaft is added, further improving the monitoring system of the rotating shaft operation status from the axial dimension. By paying attention to the changes in radial and axial positions at the same time, the actual state of the rotating shaft during operation can be more comprehensively and three-dimensionally grasped, providing more abundant data support for the accurate judgment of the compressor operation status.

[0097] In some embodiments, Figure 6 As shown, the method for detecting the operating status of the compressor includes the following steps:

[0098] Step S401: when the compressor is in a closed state, obtaining a first initial radial position value of the rotating shaft measured by a first position sensor, and obtaining a second initial radial position value of the rotating shaft measured by a second position sensor;

[0099] Step S402: when the compressor is in operation, obtaining a first real-time radial position value of the rotating shaft measured by the first position sensor, and obtaining a second real-time radial position value of the rotating shaft measured by the second position sensor;

[0100] Step S403: calculating a first difference between the first initial radial position value and the first real-time radial position value, and calculating a second difference between the second initial radial position value and the second real-time radial position value;

[0101] Step S404: If both the first difference and the second difference are greater than or equal to the first preset value, it is determined that the rotating shaft is in a normal floating state. If either the first difference or the second difference is less than the first preset value, it is determined that the rotating shaft has not floated up normally.

[0102] In step S401, when the compressor is in the off state, the first position sensor and the second position sensor work simultaneously. The first position sensor measures and records the first initial radial position value of the rotating shaft, which reflects the initial radial position of the first support segment of the rotating shaft relative to the first air bearing in the stationary state. Similarly, the second position sensor measures and records the second initial radial position value of the rotating shaft, representing the initial radial position of the second support segment of the rotating shaft relative to the second air bearing. Since the compressor is not running and the rotating shaft is in a stable stationary state, these initial values provide reliable reference data for comparison in the subsequent operating state.

[0103] In step S402, when the compressor starts and is in the running state, the first position sensor and the second position sensor continuously monitor the change in the radial position of the rotating shaft. The first position sensor obtains and records in real time the first real-time radial position value of the first support segment of the rotating shaft, which reflects the real-time radial position state of the first support segment of the rotating shaft relative to the first air bearing during operation. Similarly, the second position sensor obtains and records the second real-time radial position value, reflecting the real-time radial position of the second support segment of the rotating shaft relative to the second air bearing.

[0104] In step S403, subtract the first real-time radial position value from the first initial radial position value to obtain the first difference, which quantifies the change in the radial position of the rotating shaft from the stationary state to the running state within the monitoring area of the first position sensor. At the same time, calculate the second difference by subtracting the second real-time radial position value from the second initial radial position value. The second difference reflects the change in the radial position of the rotating shaft within the monitoring area of the second position sensor. By calculating these two differences, it is possible to quantitatively compare the change in the radial position of the rotating shaft from both ends, providing a more comprehensive basis for judging the floating state of the rotating shaft.

[0105] In step S404, when both the first difference and the second difference are greater than or equal to the first preset value, it indicates that at both ends of the rotating shaft, the change in its radial position is within a reasonable range, and the air bearings can effectively support the rotating shaft and maintain its normal floating state. At this time, it can be determined that the rotating shaft is in a normal floating state. On the contrary, if either the first difference or the second difference is less than the first preset value, it means that at one end of the rotating shaft, the change in the radial position is abnormal. It may be that the air film formation of the corresponding air bearing is unstable, or there are other factors affecting the normal floating of the rotating shaft. Therefore, it is determined that the rotating shaft has not floated up normally.

[0106] In this embodiment, two position sensors are used to monitor from both ends of the rotating shaft. Compared with a single sensor, it can comprehensively grasp the radial position change of the rotating shaft during operation. By comprehensively judging the two differences, the accuracy of judging the floating state of the rotating shaft is improved, and misjudgment of the overall operation state caused by undetected local abnormalities is avoided. When it is determined that the rotating shaft does not float normally, according to the situations of the first difference and the second difference, it can be quickly determined which end of the rotating shaft has problems. If the first difference is less than the first preset value and the second difference is normal, then the fault may be concentrated in the first air bearing, the first position sensor and related connection parts; and vice versa. This helps the operator quickly locate the fault position, improves the efficiency of fault troubleshooting and repair, and reduces the equipment downtime.

[0107] In some embodiments, as Figure 7 shown, the method for detecting the operating state of the compressor further includes the following steps:

[0108] Step S501: Retrieve the recorded real-time radial position value of the rotating shaft measured by the first position sensor when the compressor was in the previous operating state;

[0109] Step S502: Calculate the average value of the real-time radial position values of the recorded real-time radial position values;

[0110] Step S503: Calculate the change rate value between the average value of the real-time radial position values and the first real-time radial position value;

[0111] Step S504: Determine that the rotating shaft is in a normal floating state according to the change rate value being less than or equal to the preset change rate, and determine that the rotating shaft does not float normally according to the change rate value being greater than the preset change rate.

[0112] In step S501, when the compressor starts and is in the current operating state, first, it is necessary to retrieve from the storage device the recorded real-time radial position value of the rotating shaft measured by the first position sensor when the compressor was in the previous operating state. The historical data records the radial position states of the rotating shaft at different times during the previous operation, providing a comparison reference for the analysis of the current operating state. The storage device can be the memory in the control device of the compressor or an externally connected database. Through specific data reading interfaces and programs, these historical data can be quickly and accurately obtained.

[0113] In step S502, after obtaining the real-time radial position numerical records in the previous running state, statistical analysis is performed on these data. By calculating the average value of all recorded values, a data representing the average level of the shaft radial position in the previous running state is obtained. The method for calculating the average value usually adopts the arithmetic mean, that is, adding all recorded values and then dividing by the total number of data. For example, if there are n real-time radial position values in the previous running record, which are x1, x2,... xn respectively, the average value is (x1 + x2 +... + xn) / n. The average value can eliminate the randomness and fluctuation of single measurement data and more stably reflect the radial position characteristics of the shaft during the previous running.

[0114] In step S503, the average value of the real-time radial position numerical values calculated in the previous step is compared with the first real-time radial position numerical value measured by the first position sensor in the current running state. By calculating the change rate value between the two, the degree of change of the shaft radial position from the previous running to the current running is measured. The calculation formula of the change rate value can be: change rate value = |(first real-time radial position numerical value - average value of real-time radial position numerical values) / average value of real-time radial position numerical values| × 100%. The value obtained by this formula is a percentage value, which intuitively shows the change range of the current radial position relative to the previous average position.

[0115] In step S504, a preset change rate is determined in advance based on various factors such as the performance parameters of the compressor, operation experience, and design requirements of the equipment. When the calculated change rate value is less than or equal to the preset change rate, it indicates that the change of the shaft radial position between the current running and the previous running is within a reasonable range, and the air-floating bearing can continuously and stably support the shaft and maintain its normal floating state. Therefore, it can be determined that the shaft is in a normal floating state. On the contrary, if the change rate value is greater than the preset change rate, it indicates that the change of the shaft radial position exceeds the normal range, which may be due to changes in the performance of the air-floating bearing or abnormal operation environment of the equipment, etc., resulting in the shaft being unable to float normally, and then it is determined that the shaft has not floated up normally.

[0116] In this embodiment, the value range of the preset change rate is 5% - 15%, such as 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%.

[0117] Preferably, in an exemplary embodiment, the preset change rate value can be set to 10%.

[0118] According to an embodiment of the present invention, there is also provided a computer storage medium, on which computer-readable instructions are stored. When the computer-readable instructions are executed by one or more processors, the one or more processors are caused to execute the method for detecting the operating state of a compressor in any embodiment of the present invention. The method for detecting the operating state of a compressor may include, but is not limited to, at least one of the following steps: when the compressor is in the off state, obtaining a first initial radial position value of the rotating shaft measured by a first position sensor; when the compressor is in the operating state, obtaining a first real-time radial position value of the rotating shaft measured by the first position sensor; calculating a first difference between the first initial radial position value and the first real-time radial position value; determining that the rotating shaft is in a normal floating state according to the first difference being greater than or equal to a first preset value, and determining that the rotating shaft is not normally floating according to the first difference being less than the first preset value.

[0119] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a definable sequence of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable storage medium for use by an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other systems that can fetch and execute instructions from the instruction execution system, apparatus, or device), or in connection with these instruction execution systems, apparatus, or devices. For the purposes of this specification, a "computer-readable storage medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable storage medium include the following: an electrical connection portion with one or more wirings (electronic device), a portable computer diskette (magnetic device), a random access memory (RAM, Random Access Memory), a read-only memory (ROM, Read-Only Memory), an erasable programmable read-only memory (EPROM, Erasable Programmable Read-Only Memory, or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM, Compact Disc Read-Only Memory). Additionally, the computer-readable storage medium can even be paper or other suitable media on which the program can be printed, because the program can be obtained electronically, for example, by optically scanning the paper or other media, then editing, interpreting, or otherwise processing it as appropriate, and then storing it in a computer memory.

[0120] It should be understood that each part of the present invention can be implemented by hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, any one or a combination of the following techniques well known in the art can be used: discrete logic circuits having logic gate circuits for implementing logical functions on data signals, application specific integrated circuits having appropriate combinational logic gate circuits, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), and the like.

[0121] As described above, only the preferred specific embodiments of the present invention are given, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. An air suspension compressor structure, characterized in that, The structure of the air suspension compressor includes a motor housing, an air bearing, a rotating shaft, and a first position sensor. The air bearing is fixedly arranged inside the motor housing. The rotating shaft passes through the air bearing. The first position sensor is installed on the air bearing and is arranged annularly on the radial outer side of the rotating shaft. The first position sensor is annular and coaxially arranged with the air bearing. The first position sensor is used to detect the radial position value of the rotating shaft relative to the air bearing.

2. The structure of the air suspension compressor according to claim 1, wherein, The air bearing includes a first air bearing and a second air bearing arranged at intervals along the axial direction of the rotating shaft. Along the axial direction of the rotating shaft, the rotating shaft includes a first support section, a main body section, and a second support section connected in sequence. The first support section passes through the first air bearing, and the second support section passes through the second air bearing. The first position sensor is installed on the first air bearing. The first position sensor is used to detect the radial position value of the first support section relative to the first air bearing.

3. The structure of the air suspension compressor according to claim 2, characterized in that, The structure of the air suspension compressor further includes an axial target disk. The axial target disk is fixedly sleeved on the rotating shaft. Along the axial direction, part of the axial target disk is arranged opposite to the first position sensor. The first position sensor can detect the axial position value of the rotating shaft relative to the first air bearing through the axial target disk.

4. The structure of the air suspension compressor according to claim 3, characterized in that, The structure of the air suspension compressor further includes a limiting component and a thrust disk. The limiting component is installed inside the motor housing. The limiting component defines a limiting gap extending radially along the rotating shaft. The thrust disk is fixedly sleeved on the rotating shaft, and at least part of the thrust disk is located inside the limiting gap. Wherein, along the axial direction, the axial target disk is arranged between the first position sensor and the thrust disk.

5. The structure of the air suspension compressor according to claim 4, characterized in that, The limiting component includes: A first support, fixed inside the motor housing and arranged annularly outside the rotating shaft. A second support, fixed inside the motor housing and arranged annularly outside the rotating shaft. Along the axial direction, a limiting gap is defined between the first support and the second support. A first thrust bearing, arranged inside the limiting gap and installed on the first support. A second thrust bearing, arranged inside the limiting gap and installed on the second support. The second thrust bearing and the first thrust bearing are arranged at intervals along the axial direction. The thrust disk is located between the first thrust bearing and the second thrust bearing.

6. The structure of the air suspension compressor according to claim 5, characterized in that, Along the axial direction, a first assembly groove is provided at one end of the first support facing away from the second support. The first air bearing is installed in the first assembly groove.

7. The air suspension compressor structure according to any one of claims 2 to 6, characterized in that, Along the axial direction, a first installation groove is provided at one end of the first air bearing facing away from the second air bearing. The first position sensor is installed in the first installation groove.

8. The structure of the air suspension compressor according to any one of claims 2 to 6, characterized in that, The structure of the air suspension compressor further includes a second position sensor. The second position sensor is installed on the second air bearing. The second position sensor is used to detect the radial position value of the second support section relative to the second air bearing.

9. A compressor, characterized in that, The compressor includes the air suspension compressor structure as described in any one of claims 1 to 8, and the compressor further includes a control device, which is electrically connected to the first position sensor, and the control device is configured to judge and output the suspension state of the rotating shaft according to the radial position value.

10. A method for detecting the operating state of a compressor, characterized in that, The compressor is the compressor as described in claim 9, and the method for detecting the operating state of the compressor includes: When the compressor is in the closed state, obtaining a first initial radial position value of the rotating shaft measured by the first position sensor; When the compressor is in the operating state, obtaining a first real-time radial position value of the rotating shaft measured by the first position sensor; Calculating a first difference obtained by subtracting the first real-time radial position value from the first initial radial position value; Determining that the rotating shaft is in a normal suspension state according to the first difference being greater than or equal to a first preset value, and determining that the rotating shaft is not normally lifted according to the first difference being less than the first preset value.

11. The method for detecting the operating state of a compressor according to claim 10, wherein Before the step of calculating the first difference obtained by subtracting the first real-time radial position value from the first initial radial position value, the method for detecting the operating state of the compressor further includes the following steps: Judging whether the first initial radial position value is greater than a second preset value; Determining that the rotating shaft has a wear fault according to the first initial radial position value being greater than the second preset value; According to the first initial radial position value being less than or equal to the second preset value, performing the step of calculating the first difference obtained by subtracting the first real-time radial position value from the first initial radial position value.

12. The method for detecting the operating state of a compressor according to claim 10, characterized in that, The method for detecting the operating state of the compressor further includes: When the compressor is in the closed state, obtaining an initial axial position value of the rotating shaft measured by the first position sensor; When the compressor is in the operating state, obtaining a real-time axial position value of the rotating shaft measured by the first position sensor; Calculating an axial difference obtained by subtracting the real-time axial position value from the initial axial position value; Determining that the rotating shaft is in a normal suspension state according to the axial difference being less than or equal to a third preset value, and determining that the rotating shaft is not normally lifted according to the axial difference being greater than the third preset value.

13. The method for detecting the operating state of a compressor according to any one of claims 10 to 12, characterized in that, The method for detecting the operating state of the compressor further includes: When the compressor is in the closed state, obtaining a second initial radial position value of the rotating shaft measured by the second position sensor; When the compressor is in the operating state, obtaining a second real-time radial position value of the rotating shaft measured by the second position sensor; Calculating a second difference obtained by subtracting the second real-time radial position value from the second initial radial position value; Determining that the rotating shaft is in a normal suspension state according to both the first difference and the second difference being greater than or equal to the first preset value, and determining that the rotating shaft is not normally lifted according to any one of the first difference and the second difference being less than the first preset value.

14. The method for detecting the operating state of a compressor according to any one of claims 10 to 12, characterized in that, The method for detecting the operating state of the compressor further includes: Retrieving the real-time radial position value record of the rotating shaft measured by the first position sensor when the compressor was in the previous operating state; Calculating the average value of the real-time radial position values in the real-time radial position value record; Calculate the change rate value between the numerical average value of the real-time radial position and the first real-time radial position value; Determine that the rotating shaft is in a normal floating state according to the change rate value being less than or equal to a preset change rate, and determine that the rotating shaft is not floating normally according to the change rate value being greater than the preset change rate.

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