A water turbine and a main shaft vibration active control magnetic bearing bush device thereof

Abstract

This utility model discloses a hydraulic turbine and its main shaft vibration active control magnetic bearing device, relating to the field of hydraulic turbine technology. The main shaft vibration active control magnetic bearing device includes: a bearing housing, which is sleeved on the outer periphery of the hydraulic turbine's main shaft; a connecting seat, which is located on the top of the bearing housing; magnets, in which multiple independent magnets cooperate to form a ring structure, each magnet being disposed on the connecting seat, and the bore wall of the magnet is provided with multiple electromagnet bearings for winding electromagnet coils, the multiple electromagnet bearings surrounding each other in a ring to form a receiving hole; a magnetic sleeve, which is sleeved on the outer periphery of the main shaft, and the magnetic sleeve is located within the receiving hole; a displacement monitoring component, which is used to monitor the swing value of the main shaft; and a control device, in which the displacement monitoring component and each electromagnet coil are connected. This device can perform online dynamic balance adjustment of the hydraulic turbine's main shaft, so that the main shaft runs stably when it swings with the turbine runner.

Description

Technical Field

[0001] This utility model relates to the field of water turbine technology, and more specifically, to a magnetic bearing device for active control of main shaft vibration. Furthermore, it also relates to a water turbine including the aforementioned magnetic bearing device for active control of main shaft vibration. Background Technology

[0002] Hydropower turbines are important hydroelectric equipment and an indispensable component of the hydropower industry. They are crucial for fully utilizing clean and renewable energy to achieve energy conservation, emission reduction, and environmental pollution reduction, and their technological development is commensurate with the scale of my country's hydropower industry. Driven by strong electricity demand in my country, the country's hydropower turbine and auxiliary equipment manufacturing industry has entered a period of rapid development, with significant improvements in both economic scale and technological level.

[0003] When a water turbine is working, the flow direction and velocity of the water flow vary greatly, which can cause uneven stress on the turbine runner. Since the turbine runner is fixedly connected to the main shaft, the main shaft will swing with the turbine runner, resulting in unstable operation of the water turbine and affecting its service life. The current solution is to shut down the water turbine and then perform offline dynamic balancing on the main shaft, but this method will cause a lot of time and money losses.

[0004] In summary, how to perform online dynamic balancing adjustment of the turbine main shaft is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a magnetic bearing device for active control of main shaft vibration, which can perform online dynamic balance adjustment of the turbine main shaft, so that the main shaft runs stably when it follows the swing of the turbine runner.

[0006] Another objective of this invention is to provide a water turbine that includes the aforementioned active control magnetic bearing device for main shaft vibration.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A magnetic bearing device for active control of spindle vibration, comprising:

[0009] The bearing housing is fitted onto the outer periphery of the turbine's main shaft.

[0010] A connecting seat is located on the top of the bearing housing;

[0011] A magnet, multiple independent magnets cooperate to form a ring structure, each magnet is disposed on the connecting seat, and the hole wall of the magnet is provided with multiple electromagnet bearings for winding electromagnet coils, and the multiple electromagnet bearings are arranged in a ring to form a receiving hole;

[0012] A magnetic sleeve is fitted onto the outer circumferential surface of the main shaft, and the magnetic sleeve is located within the receiving hole;

[0013] A displacement monitoring component for monitoring the swing value of the spindle;

[0014] The control device is connected to the displacement monitoring component and each of the electromagnet coils.

[0015] In one embodiment, the displacement monitoring component includes a position sensor and an eddy current sensor. Each magnet has a mounting base at its upper end, and the eddy current sensor is mounted on the mounting base. Each position sensor and each eddy current sensor are correspondingly arranged, and each position sensor is spaced apart at the top of the magnetic sleeve. Both the position sensor and the eddy current sensor are connected to the control device.

[0016] In one embodiment, the mounting base includes an arc-shaped base or a V-shaped base, and the eddy current sensor is located at the center of the arc-shaped base or the V-shaped base.

[0017] In one embodiment, a plurality of electromagnet bearings are symmetrically arranged on the outer periphery of the magnetic sleeve, and the number of electromagnet bearings is even.

[0018] In one embodiment, the magnetic sleeve and the electromagnet bearing are fitted with a clearance.

[0019] In one embodiment, each of the magnets can be detachably mounted on the connecting seat to adjust the gap between each of the electromagnet bearings and the magnetic sleeve.

[0020] In one embodiment, the connecting seat is provided with a plurality of slide rails in the radial direction, and a slide plate is slidably provided on the slide rails. Each slide plate corresponds to the distribution of the magnets. The magnets are disposed on the slide plates, and the slide plates are fixed to the connecting seat by locking members.

[0021] In one embodiment, a gap region is provided between two adjacent magnets, and the gap region is a triangular gap.

[0022] In one embodiment, the gap region is filled with a magnetic shielding element to avoid affecting the magnetic field of two adjacent magnets.

[0023] A water turbine includes the magnetic bearing device for active control of main shaft vibration as described in any of the above claims.

[0024] When using the main shaft vibration active control magnetic bearing device provided by this utility model, a turbine runner is provided at the bottom end of the main shaft, a bearing housing is fitted on the outer periphery of the turbine main shaft, a connecting seat is provided on the top of the bearing housing, and multiple independent magnets are provided on the connecting seat. Each magnet has multiple electromagnet bearings for winding electromagnet coils on its hole wall, and the multiple electromagnet bearings are arranged in a ring to form a receiving hole. A magnetic sleeve is fitted on the outer periphery of the main shaft, and the magnetic sleeve is located within the receiving hole. A displacement monitoring component is used to monitor the swing value of the main shaft and transmit the swing value to the control device in real time.

[0025] When the control device detects that the spindle's swing value is greater than the preset value, the control device can control the operation of the corresponding electromagnet coil to control the magnitude of the current in the electromagnet coil, thereby changing the electromagnetic force on the magnetic sleeve. Ultimately, the electromagnetic force acting on the magnetic sleeve is equal to the electromagnetic force acting on the spindle, so that the electromagnetic force on the spindle cancels out the unbalanced force, achieving the purpose of dynamic balance. When the displacement monitoring component detects that the spindle has reached dynamic balance, the displacement monitoring component can send a signal to the control device, and the control device can disconnect the current in the electromagnet coil to avoid breaking the dynamic balance.

[0026] Furthermore, the spindle uses a magnetic levitation bearing, which has a simple structure, short response time, and enables real-time online balance adjustment of the spindle. In addition, the multiple magnets in this device are installed independently without interference, facilitating adjustment of the gap between the magnet and the magnetic sleeve. This also reduces the difficulty of magnet manufacturing, as each magnet can be fabricated individually.

[0027] In summary, the magnetic bearing device for active control of main shaft vibration provided by this utility model can perform online dynamic balance adjustment of the turbine main shaft, so that the main shaft runs stably when it follows the swing of the turbine runner.

[0028] In addition, this utility model also provides a water turbine including the above-mentioned main shaft vibration active control magnetic bearing device. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0030] Figure 1 A schematic diagram of the active control magnetic bearing device for spindle vibration provided by this utility model;

[0031] Figure 2 A top view of the magnetic bearing device for active control of spindle vibration.

[0032] Figures 1-2 middle:

[0033] 1 is the main spindle, 2 is the magnetic sleeve, 3 is the bearing housing, 31 is the water guide bearing, 4 is the connecting seat, 5 is the magnet, 51 is the electromagnet bearing, 52 is the receiving hole, 53 is the electromagnet coil, 54 is the position sensor, 55 is the eddy current sensor, and 56 is the mounting base. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] The core of this invention is to provide a magnetic bearing device for active control of main shaft vibration, which can perform online dynamic balance adjustment of the turbine main shaft, ensuring stable operation of the main shaft as it swings with the turbine runner. Another core aspect of this invention is to provide a turbine that includes the aforementioned magnetic bearing device for active control of main shaft vibration.

[0036] Please refer to Figure 1 and Figure 2 This specific embodiment provides a magnetic bearing device for active control of spindle vibration, including:

[0037] Bearing housing 3, which is sleeved on the outer periphery of the main shaft 1 of the water turbine;

[0038] Connecting seat 4 is located on top of bearing housing 3;

[0039] Magnet 5, multiple independent magnets 5 cooperate to form a ring structure, each magnet 5 is set on the connecting seat 4, the hole wall of the magnet 5 is provided with multiple electromagnet bearings 51 for winding electromagnet coil 53, and multiple electromagnet bearings 51 are arranged in a ring to form a receiving hole 52.

[0040] The magnetic sleeve 2 is sleeved on the outer circumferential surface of the main shaft 1, and the magnetic sleeve 2 is located inside the receiving hole 52;

[0041] Displacement monitoring component, which is used to monitor the swing value of spindle 1;

[0042] The control device, displacement monitoring component, and each electromagnet coil 53 are all connected to the control device.

[0043] It should be noted that if the magnet 5 (such as an electromagnet) is a one-piece structure, when installing the one-piece electromagnet and adjusting the gap between the one-piece electromagnet and the magnetic sleeve 2, the various parts of the one-piece electromagnet are interconnected. For example, when it is necessary to adjust the gap between each side wall of the one-piece electromagnet and the magnetic sleeve 2 separately, the one-piece electromagnet cannot meet this requirement. However, this application specifically sets the ring structure as a split type with multiple independent magnets 5, which allows adjustment of the gap between each magnet 5 and the magnetic sleeve 2, ensuring that the gap between each magnet 5 and the magnetic sleeve 2 is controllable.

[0044] It should also be noted that a water-guided bearing bush 31 is fixed inside the bearing housing 3. When the electromagnet coil 53 cannot be energized, the water-guided bearing bush 31 can act as a bearing support, allowing the main shaft 1 to safely stop rotating. In actual application, the shape, structure, type, position, and number of the bearing housing 3, connecting seat 4, magnet 5, magnetic sleeve 2, displacement monitoring components, and control devices can be determined according to the actual situation and requirements.

[0045] When using the main shaft vibration active control magnetic bearing device provided by this utility model, a turbine runner is provided at the bottom end of the main shaft 1, a bearing housing 3 is sleeved on the outer periphery of the main shaft 1 of the turbine, a connecting seat 4 is provided on the top of the bearing housing 3, and multiple independent magnets 5 are provided on the connecting seat 4. Multiple electromagnet bearings 51 for winding electromagnet coils 53 are provided on the hole walls of each magnet 5, and the multiple electromagnet bearings 51 are arranged in a ring to form a receiving hole 52. A magnetic sleeve 2 is sleeved on the outer periphery of the main shaft 1, and the magnetic sleeve 2 is located inside the receiving hole 52. A displacement monitoring component is used to monitor the swing value of the main shaft 1 and transmit the swing value to the control device in real time.

[0046] When the control device detects that the swing value of the main shaft 1 is greater than the preset value, the control device can control the operation of the corresponding electromagnet coil 53 to control the current of the electromagnet coil 53, so that the magnetic sleeve 2 is subjected to a change in electromagnetic force. Finally, the electromagnetic force acting on the magnetic sleeve 2 is equal to the electromagnetic force acting on the main shaft 1, so that the electromagnetic force on the main shaft 1 cancels out the unbalanced force, so that the main shaft 1 is located at the center of the magnetic sleeve 2, achieving the purpose of dynamic balance. When the displacement monitoring component detects that the main shaft 1 has reached dynamic balance, the displacement monitoring component can send a signal to the control device, and the control device can disconnect the current of the electromagnet coil 53 to avoid breaking the dynamic balance.

[0047] Furthermore, the spindle 1 uses a magnetic levitation bearing, which has a simple structure and short response time, enabling real-time online balance adjustment of the spindle 1. In addition, the multiple magnets 5 of this device are installed independently without interference, facilitating adjustment of the gap between the magnet 5 and the magnetic sleeve 2. This also effectively reduces the machining difficulty of the magnets 5, allowing each magnet 5 to be manufactured individually.

[0048] In summary, the magnetic bearing device for active control of main shaft vibration provided by this utility model can perform online dynamic balance adjustment of the turbine main shaft, so that the main shaft runs stably when it follows the swing of the turbine runner.

[0049] In one embodiment, the displacement monitoring assembly includes a position sensor 54 and an eddy current sensor 55. Each magnet 5 has a mounting base 56 at its upper end, and the eddy current sensor 55 is mounted on the mounting base 56. The position sensor 54 and the eddy current sensor 55 are correspondingly arranged, and each position sensor 54 is spaced apart at the top of the magnetic sleeve 2. Both the position sensor 54 and the eddy current sensor 55 are connected to a control device. Through the cooperation of the position sensor 54 and the eddy current sensor 55, the swing value of the spindle 1 can be measured in real time.

[0050] In one embodiment, the mounting base 56 includes an arc-shaped base or a V-shaped base, and the eddy current sensor 55 is located at the center of the arc-shaped base or the V-shaped base to ensure that the eddy current sensor 55 accurately detects the magnetic force changes of each magnet 5.

[0051] In one embodiment, a plurality of electromagnet bearings 51 are symmetrically arranged on the outer periphery of the magnetic sleeve 2, and the number of electromagnet bearings 51 is even. The number of electromagnet bearings 51 can be matched according to the diameter of the main shaft 1. The larger the diameter of the main shaft 1, the more electromagnet bearings 51 are required. For example, 4, 8 or 16 electromagnet bearings 51 can be provided.

[0052] In one embodiment, the magnetic sleeve 2 and the electromagnet bearing 51 are in clearance fit.

[0053] In one embodiment, each magnet 5 can be detachably mounted on the connecting seat 4 to adjust the gap between each electromagnet bearing 51 and the magnetic sleeve 2.

[0054] In one embodiment, the connecting base 4 is provided with multiple slide rails in the radial direction, and a slide plate is slidably mounted on the slide rails. Each slide plate corresponds to a magnet 5, which is mounted on the slide plate. The slide plate is fixed to the connecting base 4 by a locking member. The separate position sensor 54, magnet 5, and slide plate can be connected by the locking member to form an integrated structure. Furthermore, locking members can be provided on both sides of the slide plate (i.e., the connecting plate) to effectively fix the magnet 5 and the position sensor 54.

[0055] In one embodiment, such as Figure 2 As shown, a notch area is provided between two adjacent magnets 5, and the notch area is a triangular notch. In actual application, the size, number, position, etc. of the magnets can be determined according to the actual situation and actual needs. A notch area will be left between two adjacent magnets 5 to avoid mutual interference between the electromagnet coils 53 of the two adjacent magnets 5, which would prevent them from being installed.

[0056] In one embodiment, the gap area is filled with a magnetic shielding element to avoid affecting the magnetic field of the two adjacent magnets 5.

[0057] In addition to the aforementioned active control magnetic bearing device for main shaft vibration, this utility model also provides a water turbine that includes the active control magnetic bearing device for main shaft vibration disclosed in the above embodiments. For the structure of other parts of the water turbine, please refer to the prior art, which will not be repeated here.

[0058] In addition, it should be noted that the orientation or positional relationship indicated by "top" and "bottom" in this application is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the purpose of simplifying the description and making it easier to understand, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0059] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. Any combination of all embodiments provided by this utility model is within the protection scope of this utility model and will not be elaborated upon here.

[0060] The above provides a detailed description of the water turbine and its main shaft vibration active control magnetic bearing device provided by this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A magnetic bearing device for active control of spindle vibration, characterized in that, include: The bearing housing (3) is fitted around the outer periphery of the main shaft (1) of the water turbine; A connecting seat (4) is located on top of the bearing housing (3); A magnet (5), multiple independent magnets (5) cooperate to form a ring structure, each magnet (5) is provided on the connecting seat (4), the hole wall of the magnet (5) is provided with multiple electromagnet bearings (51) for winding electromagnet coil (53), and the multiple electromagnet bearings (51) are arranged in a ring to form a receiving hole (52). A magnetic sleeve (2) is fitted onto the outer circumferential surface of the main shaft (1), and the magnetic sleeve (2) is located inside the receiving hole (52); A displacement monitoring component for monitoring the swing value of the main shaft (1); The control device is connected to the displacement monitoring component and each of the electromagnet coils (53).

2. The active control magnetic bearing device for spindle vibration according to claim 1, characterized in that, The displacement monitoring component includes a position sensor (54) and an eddy current sensor (55). Each magnet (5) has a mounting base (56) at its upper end. The eddy current sensor (55) is mounted on the mounting base (56). Each position sensor (54) and each eddy current sensor (55) are correspondingly arranged. Each position sensor (54) is spaced apart at the top of the magnetic sleeve (2). Both the position sensor (54) and the eddy current sensor (55) are connected to the control device.

3. The active control magnetic bearing device for spindle vibration according to claim 2, characterized in that, The mounting base (56) includes an arc-shaped base or a V-shaped base, and the eddy current sensor (55) is located at the center of the arc-shaped base or the V-shaped base.

4. The active control magnetic bearing device for spindle vibration according to any one of claims 1 to 3, characterized in that, The outer periphery of the magnetic sleeve (2) is symmetrically provided with a plurality of electromagnet bearings (51), and the number of electromagnet bearings (51) is even.

5. The active control magnetic bearing device for spindle vibration according to any one of claims 1 to 3, characterized in that, The magnetic sleeve (2) and the electromagnet bearing (51) are fitted with a clearance.

6. The active control magnetic bearing device for spindle vibration according to claim 5, characterized in that, Each of the magnets (5) can be detachably mounted on the connecting seat (4) to adjust the gap between each of the electromagnet bearings (51) and the magnetic sleeve (2).

7. The active control magnetic bearing device for spindle vibration according to claim 6, characterized in that, The connecting seat (4) is provided with multiple slide rails in the radial direction. Slide plates are slidably provided on the slide rails. Each slide plate is distributed corresponding to the magnet (5). The magnet (5) is provided on the slide plate, and the slide plate is fixed on the connecting seat (4) by a locking member.

8. The active control magnetic bearing device for spindle vibration according to any one of claims 1 to 3, characterized in that, A gap region is provided between two adjacent magnets (5), and the gap region is a triangular gap.

9. The active control magnetic bearing device for spindle vibration according to claim 8, characterized in that, The gap area is filled with a magnetic shielding element to avoid affecting the magnetic field of the two adjacent magnets (5).

10. A water turbine, characterized in that, The magnetic bearing device for active control of spindle vibration as described in any one of claims 1-9 above.

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