Surge suppression device used for compressor and based on deflection of magnetic suspension bearing

Abstract

The utility model discloses a surge suppression device based on deflection of a magnetic suspension bearing for a compressor, which comprises a sensor device arranged on the compressor and used for monitoring operation state parameters of the compressor in real time; the controller is electrically connected with the sensor device and used for judging whether the compressor is in a surge precursor state or not according to the operation state parameters and generating a control signal when the judgment result is yes; and the magnetic suspension bearing assembly comprises a magnetic suspension bearing and a magnetic suspension bearing driver, the magnetic suspension bearing is used for supporting a rotor of the compressor, and the magnetic suspension bearing driver is electrically connected with the controller and used for receiving the control signal and driving the magnetic suspension bearing according to the control signal to enable the rotor to generate eccentricity so as to change an airflow channel in the compressor. By monitoring the deflection amount of the magnetic suspension bearing in real time, an early warning or shutdown instruction can be sent out in time, surge is effectively avoided or relieved, and the operation stability and safety of the compressor are improved.

Description

Technical Field

[0001] This utility model relates to the field of compressor surge suppression technology, and in particular to a surge suppression device for compressors based on magnetic levitation bearing yaw. Background Technology

[0002] Currently, turbo compressors, especially centrifugal compressors, are widely used in modern industry. However, these compressors are prone to surge during operation, which occurs when the flow rate decreases to a certain level, causing unstable fluctuations in the internal airflow of the compressor, resulting in severe pressure and flow rate oscillations, accompanied by loud noise and vibration. Surge can seriously affect the performance and stability of the compressor, and even cause equipment damage. Therefore, effectively suppressing surge is crucial for the safe and stable operation of the compressor.

[0003] Traditional surge suppression methods primarily rely on monitoring parameters such as pressure and flow rate at the compressor's inlet and outlet, and adjusting devices like intake valves, vent valves, or guide vanes according to a preset control strategy to change the compressor's operating point and move it away from the surge region. However, this surge protection method based on current fluctuations has some insurmountable drawbacks:

[0004] Sensitivity issues: Traditional methods rely on monitoring changes in parameters such as pressure and flow rate, but changes in these parameters often lag behind the occurrence of surge, resulting in untimely warnings and controls.

[0005] Response speed: Traditional regulating devices, such as intake valves and exhaust valves, have relatively slow response speeds and are unable to cope with rapid changes in surge.

[0006] Complex control strategies: Designing effective control strategies requires complex calculations and debugging, which increases the cost and difficulty of application.

[0007] Risk of false alarms and missed alarms: Due to factors such as environmental noise and sensor accuracy, traditional methods are prone to false alarms and missed alarms, which can affect the control effect.

[0008] In recent years, with the rapid development of magnetic levitation bearing technology, its advantages such as non-contact, frictionless operation, high precision, and high-speed rotation have led to its increasingly widespread application in the compressor field. The emergence of magnetic levitation bearings has provided new ideas and methods for surge suppression.

[0009] However, due to the inherent characteristics of magnetic bearings, traditional surge protection methods based on current fluctuations are not entirely suitable for magnetic compressors. Magnetic bearings require extremely high stability and precision to maintain the rotor's levitation state. Traditional current fluctuation protection methods may cause fluctuations in the control current of the magnetic bearing, thereby affecting its stability and precision, and even triggering other malfunctions.

[0010] Therefore, developing a more reliable and effective surge suppression method is crucial for improving the operational stability and safety of magnetic levitation compressors. Utility Model Content

[0011] In view of the problems of insufficient sensitivity, slow response speed, complex control strategy and high risk of false alarm and missed alarm in the existing compressor surge suppression methods, this utility model aims to provide a surge suppression device based on magnetic levitation bearing yaw for compressors, which can overcome the above-mentioned shortcomings and achieve a more reliable and accurate surge suppression effect.

[0012] This invention provides a surge suppression device for compressors based on magnetic bearing yaw rate, comprising: a sensor device disposed on the compressor for real-time monitoring of the compressor's operating status parameters; a controller electrically connected to the sensor device for determining whether the compressor is in a pre-surge state based on the operating status parameters, and generating a control signal when the determination result is yes; and a magnetic bearing assembly including a magnetic bearing and a magnetic bearing driver, wherein the magnetic bearing supports the compressor rotor, and the magnetic bearing driver is electrically connected to the controller for receiving the control signal and driving the magnetic bearing to cause the rotor to eccentricate, thereby changing the airflow channel inside the compressor. By real-time monitoring of the magnetic bearing yaw rate, it is possible to determine whether the compressor is in a pre-surge state, enabling timely issuance of warnings or shutdown commands, effectively avoiding or mitigating surge, and improving the compressor's operational stability and safety.

[0013] Preferably, the controller determines whether the compressor is in a surge precursor state based on the operating status parameters by whether the sway of the magnetic levitation bearing is greater than a preset threshold, wherein the preset threshold is 40% of the maximum sway of the magnetic levitation bearing. This limits the specific indicator for judging surge precursors, namely, the sway exceeding 40% of the maximum value, thus improving the accuracy of the judgment.

[0014] Preferably, the sensor device collects the operating status parameters at least 10 times per second. This ensures the real-time acquisition of yaw data, enabling timely detection of rapid changes in yaw and improving the sensitivity of surge monitoring.

[0015] Preferably, the controller is further configured to count the number of times the sway of the magnetic levitation bearing exceeds the preset threshold among the operating status parameters collected by the sensor device every second, and issue a warning message when the number exceeds 5 times, and issue a stop command when the number exceeds 7 times. This improves the reliability of surge warning and protection, avoids misjudgment caused by a single sway anomaly, and reduces the risk of false alarms and missed alarms.

[0016] Preferably, the controller determines whether the compressor is in a surge precursor state based on the radial runout of the magnetic levitation bearing in a plane perpendicular to the rotor axis. This more clearly defines the runout direction used to determine surge, allowing for more targeted monitoring and control, and improving the accuracy and efficiency of surge detection.

[0017] In summary, the surge suppression device for compressors based on magnetic bearing yaw provided by this invention monitors the yaw of the magnetic bearing in real time and determines whether the compressor is in a pre-surge state according to preset thresholds and statistical rules. It can promptly issue warnings or shutdown commands, effectively avoiding or mitigating surge and improving the compressor's operational stability and safety. Compared with traditional surge protection methods based on current fluctuations, this invention has advantages such as fast response speed, high control precision, strong anti-interference ability, and low false alarm rate, making it more suitable for magnetic levitation compressors with extremely high stability and precision requirements. Attached Figure Description

[0018] Figure 1 This is a structural block diagram of a surge suppression device for a compressor based on magnetic levitation bearing yaw, according to one embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of the oscillation action of a magnetic levitation bearing according to one embodiment of the present invention. Detailed Implementation

[0020] The present invention will be described more clearly and completely below by way of embodiments and in conjunction with the accompanying drawings.

[0021] This invention provides a surge suppression device for compressors based on magnetic levitation bearing yaw, which can overcome the problems of insufficient sensitivity, slow response speed, complex control strategy, and high risk of false alarm and missed alarm in existing compressor surge suppression methods, and achieve a more reliable and accurate surge suppression effect.

[0022] like Figure 1 The diagram shows a structural block diagram of a surge suppression device for a compressor based on magnetic levitation bearing yaw rate according to an embodiment of the present invention. The device includes: a sensor device 2, a controller 4, and a magnetic levitation bearing assembly 3, wherein:

[0023] Sensor device 2 is installed on compressor 1 to monitor the operating status parameters of compressor 1 in real time. Sensor device 2 may include, but is not limited to, pressure sensors, flow sensors, acceleration sensors, etc., to monitor parameters such as inlet and outlet pressure, flow rate, and vibration of compressor 1.

[0024] Controller 4 is electrically connected to sensor device 2 and is used to determine whether compressor 1 is in a pre-surge state based on the operating status parameters monitored by sensor device 2. If the determination result is yes, a control signal is generated. Controller 4 can be a dedicated controller or a general-purpose controller, and it can store preset surge judgment algorithms and control strategies internally.

[0025] The magnetic bearing assembly 3 includes a magnetic bearing 31 and a magnetic bearing actuator (not shown in the figure). The magnetic bearing 31 supports the rotor of the compressor 1 (not shown in the figure). The magnetic bearing actuator is electrically connected to the controller 4 and receives control signals from the controller 4. Based on these signals, the actuator drives the magnetic bearing 31 to cause the rotor to become eccentric, thereby changing the airflow path inside the compressor 1. The magnetic bearing 31 can be a radial magnetic bearing or an axial magnetic bearing, and its eccentricity can be radial or axial. The structural relationship of the bearing supporting the rotor of the compressor 1 is a common practice in the art, and therefore is not shown separately. Those skilled in the art can understand its structural relationship by reading the structural block diagram.

[0026] The working principle of this utility model is as follows:

[0027] Sensor device 2 monitors the operating status parameters of compressor 1 in real time and transmits the monitored data to controller 4. Controller 4 analyzes the received data according to a preset surge detection algorithm to determine whether compressor 1 is in a surge precursor state.

[0028] Specifically, the controller 4 determines whether the compressor 1 is in a pre-surge state based on the yaw rate of the magnetic bearing 31 monitored by the sensor device 2. When the yaw rate of the magnetic bearing 31 exceeds a preset threshold, the controller 4 determines that the compressor 1 is in a pre-surge state and generates a control signal to send to the magnetic bearing driver. This preset threshold is preferably 40% of the maximum yaw rate of the magnetic bearing 31 to ensure the sensitivity and accuracy of surge monitoring. For example, assuming the maximum yaw rate of the magnetic bearing 31 is 50 μm, the preset threshold is 20 μm. When the yaw rate of the magnetic bearing 31 exceeds 20 μm, the controller 4 determines that the compressor 1 is in a pre-surge state.

[0029] To further improve the reliability of surge warning and protection and avoid misjudgment caused by single sway abnormality, the sensor device 2 preferably collects at least 10 operating status parameters per second. The controller 4 counts the number of times the sway of the magnetic levitation bearing 31 is greater than a preset threshold in the operating status parameters collected by the sensor device 2 per second, and issues a warning message when the number is greater than 5 times, and issues a stop command when the number is greater than 7 times.

[0030] For example, sensor device 2 collects the sway data of magnetic levitation bearing 31 10 times per second. If controller 4 finds that the sway data exceeds the preset threshold of 20μm 6 times within 1 second, controller 4 will issue a warning message; if the sway data exceeds the preset threshold of 20μm 8 times within 1 second, controller 4 will issue a stop command.

[0031] When controller 4 determines that compressor 1 is in a pre-surge state, the magnetic bearing driver receives a control signal and drives magnetic bearing 31 to cause rotor eccentricity, such as... Figure 2 As shown.

[0032] Specifically, the controller 4 determines whether the compressor 1 is in a pre-surge state based on the radial runout of the magnetic levitation bearing 31 in a plane perpendicular to the rotor axis, and controls the magnetic levitation bearing 31 to generate radial runout in that plane to change the airflow passage inside the compressor 1. For example, the controller 4 can control the magnetic levitation bearing 31 to generate a radial runout of 10μm in a preset direction in a plane perpendicular to the rotor axis, thereby changing the airflow passage inside the compressor 1 and avoiding or mitigating the occurrence of surge.

[0033] Figure 2 This is a schematic diagram of the yaw action of a magnetic levitation bearing according to one embodiment of the present invention, as shown below. Figure 2 As shown, when the controller 4 determines that the compressor 1 is in a surge precursor state, it controls the magnetic bearing driver to cause the magnetic bearing 31 to wobble. The figure shows a schematic diagram of the radial wobble action of the magnetic bearing 31, where: line segments Z1 and Z2 represent the rotor axis, on which the magnetic bearing 31 is mounted; the controller 4 can select to control the front or rear end of the magnetic bearing 31 according to the actual situation, to generate different degrees of radial wobble along direction 1 or direction 3, thereby flexibly changing the airflow channel inside the compressor 1 and suppressing surge.

[0034] W1, W2, W3, and W4 represent the four radial yaw directions of the rear end (non-driving end) of the magnetic levitation bearing 31 relative to the rotor axis. Among them, the W1 and W3 directions are perpendicular to each other, the W2 and W4 directions are perpendicular to each other, and the W2 and W4 direction lines exist on the plane formed by the W1 and W3 direction lines.

[0035] V1, V2, V3, and V4 represent the four radial deflection directions of the front end (drive end) of the magnetic levitation bearing 31 relative to the rotor axis. Among them, V1 and V3 are perpendicular to each other, V2 and V4 are perpendicular to each other, and the lines of V2 and V4 exist on the plane formed by the lines of V1 and V3.

[0036] Z1 represents the direction of the rotor axis, pointing towards the drive end.

[0037] Z2 represents the direction of the rotor axis, pointing towards the non-driving end.

[0038] It is important to note that Figure 2 The arrows in the diagram only indicate the direction of the yaw, not the magnitude or direction of the specific yaw displacement. During the actual yaw process, the magnetic levitation bearing 31 can generate radial yaw of different degrees in any direction under the control of the controller 4, so as to achieve precise control of the airflow inside the compressor 1.

[0039] For example, when the controller 4 detects that the sway W3 of the rear end of the magnetic levitation bearing 31 along direction 3 continues to increase and exceeds a preset threshold, it can be determined that the compressor 1 is about to experience surge. At this time, the controller 4 can control the magnetic levitation bearing driver to generate a preset radial sway V1 at the front end of the magnetic levitation bearing 31 along direction 1, thereby changing the airflow channel inside the compressor 1 and avoiding or mitigating the occurrence of surge.

[0040] Through the above-described method, the surge suppression device for compressors based on magnetic bearing yaw provided by this invention can monitor the yaw amount of the magnetic bearing in real time and determine whether the compressor is in a pre-surge state according to preset thresholds and statistical rules. It can promptly issue warnings or shutdown commands, effectively avoiding or mitigating surge and improving the compressor's operational stability and safety. Compared with traditional surge protection methods based on current fluctuations, this invention has advantages such as fast response speed, high control precision, strong anti-interference ability, and low false alarm rate, making it more suitable for magnetic levitation compressors with extremely high stability and precision requirements.

[0041] Explanation of reference numerals in the attached figures

[0042] 1. Compressor

[0043] 2. Sensor device

[0044] 3 magnetic levitation bearing components

[0045] 31 magnetic levitation bearing

[0046] 4 controllers

Claims

1. A surge suppression device for compressors based on magnetic levitation bearing yaw, characterized in that, include: A sensor device is installed on the compressor to monitor the operating status parameters of the compressor in real time; The controller, electrically connected to the sensor device, is used to determine whether the compressor is in a surge precursor state based on the operating status parameters, and to generate a control signal when the determination result is yes; as well as A magnetic levitation bearing assembly includes a magnetic levitation bearing and a magnetic levitation bearing driver. The magnetic levitation bearing supports the rotor of the compressor. The magnetic levitation bearing driver is electrically connected to the controller and is used to receive the control signal and drive the magnetic levitation bearing to cause the rotor to become eccentric according to the control signal, so as to change the airflow channel inside the compressor.

2. The surge suppression device for a compressor based on magnetic levitation bearing yaw as described in claim 1, characterized in that, The controller determines whether the compressor is in a surge precursor state based on the operating status parameters, and whether the sway of the magnetic levitation bearing is greater than a preset threshold, wherein the preset threshold is 40% of the maximum sway of the magnetic levitation bearing.

3. The surge suppression device for a compressor based on magnetic levitation bearing yaw as described in claim 2, characterized in that, The sensor device collects the operating status parameters at least 10 times per second.

4. The surge suppression device for a compressor based on magnetic levitation bearing yaw as described in claim 3, characterized in that, The controller is also used to count the number of times the sway of the magnetic levitation bearing exceeds the preset threshold from the operating status parameters collected by the sensor device every second.

5. The surge suppression device for a compressor based on magnetic levitation bearing yaw as described in claim 4, characterized in that, The controller determines whether the compressor is in a surge precursor state based on the radial runout of the magnetic levitation bearing in a plane perpendicular to the axis of the rotor.

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