A radial excitation automatic balancing device

Abstract

The application is installed on the circumference of the rotating machine rotor, which comprises a pre-tightening flange, an expansion sleeve, a moving ring, a moving ring shell, a static ring shell, a static ring, an aviation plug, a aviation plug holder, a measurement and control device and a driving device. The rotating machine rotor is a solid shaft. The outer end of the inner excitation ring is fixed on the rotating machine rotor through the expansion sleeve. The inner end of the inner excitation ring is against the partition plate. The inner ring nut retainer is screwed on the outer end of the inner excitation ring. The static ring bearing is installed on the circumference of the inner excitation ring. The inner ring of the static ring bearing is fixed on the inner ring nut retainer. The excitation framework is installed on the outer ring of the static ring bearing. The static ring shell is fixed on the outer circumference of the static ring. The aviation plug holder is installed on the outer side of the static ring shell and the moving ring shell. The aviation plug is fixed on the outer side of the aviation plug holder. Two positioning Hall elements and a reference Hall element are connected with one aviation plug through wires. Two coils are connected with another aviation plug through wires.

Description

TECHNICAL FIELD

[0001] The present application relates to a radial excitation automatic balancing device, in particular a radial excitation automatic balancing device with a through shaft. BACKGROUND

[0002] The vibration of the rotor due to mass imbalance is one of the main reasons for the failure of rotating machines such as aircraft engines and high-end machine tools. In the running process, the prominent unbalanced vibration will lead to the aggravation of the wear of the rotating machine parts, the reduction of the running efficiency, the reduction of the service life, and the reduction of the performance of the whole machine. The online automatic balancing device can realize real-time vibration suppression in the running process, and is an effective measure to solve the failure of the rotating machine caused by excessive vibration.

[0003] According to the different driving modes of the counterweight mass of the automatic balancing device, it is usually divided into three types of gas-liquid type, motor type and electromagnetic type. Among them, the gas-liquid type automatic balancing device has simple structure and no movable parts, and is usually used in high-speed occasions. However, the liquid leakage caused by the difficulty in sealing makes the balancing capacity of the device attenuate with the number of uses in the use process, and the problems such as the need for multiple auxiliary systems, which have not been widely used. The motor type automatic balancing device is easy to install, has fast balancing speed and high balancing precision, and occupies a large part of the automatic balancing market. However, the existence of gear, rack and other structures in the device makes it have high requirements for machining precision and cost, and at the same time, the internal motor power supply and signal need to cross the dynamic and static rings for transmission, which further increases the product friction loss and reduces the service life of the device. The electromagnetic slip ring type automatic balancing device was first proposed by Dyer S. W. et al. of Blance Dynamics Company in the United States in 1998. The structure is divided into dynamic ring and static ring two parts. The dynamic ring rotates with the rotor, and relies on the step of the internal counterweight disc to offset the mass imbalance of the rotor to suppress vibration. The static ring is wound with multiple turns of coil, and is connected with the measurement and control device and the power supply device to generate a magnetic field to drive the counterweight disc to step. This automatic balancing device gets rid of the restriction of complex mechanical structure, is easy to install, has simple balancing operation, fast balancing speed, no electric signal transmission between dynamic and static rings, reduces the machining difficulty, avoids the friction loss of the parts, and improves the service life of the device. At present, there are research and application at home and abroad.

[0004] Patent US2009 / 0306829A1 discloses a transiently identifiable propeller automatic balancing system, which increases the identification of transient signals, eliminates the vibration signals generated by the propeller of the aircraft during the process of working condition change such as take-off and landing, and improves the reliability of the balancing system, but the balancing device used by the system is a traditional axial excitation structure, the air gap of the moving and static rings is large, the internal magnetic field leakage is more, and the overall balancing efficiency is not high. Patent US8961140B2 discloses an automatic balancing system for an aircraft propeller, wherein the automatic balancing device used can be installed in the propeller root through the addition of a slip ring structure, the counterweight disc is provided with 200 permanent magnets, the balancing accuracy is high, but the balancing device is still an axial excitation structure, which is limited by the air gap of the moving and static rings, and the balancing efficiency is not high, and the wear of the components caused by the use of the slip ring is large, which affects the service life of the system. Patent CN101672342B discloses an automatic balancing device for high-speed rotating machinery, which converts electric energy into mechanical energy through the inverse piezoelectric effect of the piezoelectric ceramic sheet to realize the driving action of the counterweight disc, and the adjustment position of the counterweight disc per week is up to 2000, and the balancing accuracy is high, but the energy conversion efficiency is low, and the balancing efficiency is also not high, and the counterweight disc relies on friction to realize self-locking, and the component wear is large, which affects the service life of the device. Patent CN106768642B discloses a split type automatic balancing device suitable for rotating machinery, which can be split and installed at the required position of the rotor, and the installation mode is flexible and suitable for in-service engines, but the split type structure requires high machining and installation precision, the production cost is high, and the balancing efficiency of the device is not high. Patent CN110829711B discloses a radial excitation structure electromagnetic slip ring type automatic balancing device, which is improved on the basis of the traditional axial excitation structure, solves the problems of eccentricity of the counterweight disc during rotation, collision and abrasion with the excitation ring, and high leakage caused by large air gap of the moving and static rings, and adopts a permanent magnet and electromagnetic combined driving structure, which greatly improves the balancing efficiency of the balancing device, but the device needs to be installed at the end of the rotor, and a connecting flange needs to be reserved, so that the installation mode is complex and occupies a large space, and it is difficult to apply to rotating machinery such as aircraft engines.

[0005] The present application improves the installation mode of the existing radial excitation balancing device and widens the application occasions thereof. SUMMARY

[0006] The present application improves the installation mode of the existing radial excitation balancing device and widens the application occasions thereof.

[0007] In order to achieve the purpose of the present application, the present application adopts the following technical solutions:

[0008] The shaft-penetrating radial excitation automatic balancing device of the present application is installed on the circumference of the rotor of a rotating machine, and comprises a pre-tightening flange, an expansion sleeve, a moving ring, a moving ring shell, a static ring shell, a static ring, a hole plug, a plug holder, a measuring and controlling device and a driving device. The moving ring comprises an inner excitation ring, a counterweight and an outer excitation ring. The static ring comprises an inner ring nut retainer, an excitation skeleton, a coil skeleton and a coil. The moving ring shell is a cylindrical tube, and a circular annular partition plate is arranged in the center of the cylindrical tube. The shaft of the rotor of the rotating machine penetrates the center of the moving ring shell. A moving ring is arranged in the space surrounded by the partition plate, the rotor of the rotating machine and the moving ring shell. An inner excitation ring is arranged on the left and right sides of the rotor of the rotating machine. The counterweight is arranged on the inner excitation ring through a moving ring bearing. An outer excitation ring is fixed on the circumference of the moving ring shell on the left and right sides of the partition plate. The rotor of the rotating machine is a solid shaft. The outer ends of the two inner excitation rings are fixed on the rotor of the rotating machine through an expansion sleeve. The inner ends of the inner excitation rings are arranged on the partition plate. The pre-tightening flanges are arranged on the outer ends of the two expansion sleeves. The pre-tightening flanges are fixed on the inner excitation rings through screws. The inner ring nut retainer is arranged on the outer end of the inner excitation ring through a thread. The static ring bearing is arranged on the circumference of the inner excitation ring. The inner ring of the static ring bearing is fixed on the inner ring nut retainer. The excitation skeleton is arranged on the outer ring of the static ring bearing. The coil skeleton is arranged on the excitation skeleton. The coil skeleton faces the counterweight. The coil is wound in the coil skeleton. The positioning Hall element is arranged on the coil skeleton. The reference Hall element is arranged on the side of the excitation skeleton facing the moving ring shell. The static ring shells are fixed on the outer circumferences of the two excitation skeletons. The plug holders are arranged on the outer sides of the two static ring shells. The hole plugs are fixed on the outer sides of the plug holders. The two positioning Hall elements and the reference Hall element are connected to one hole plug through wires. The hole plug is connected to the measuring and controlling device through wires. The two coils are connected to the other hole plug through wires. The hole plug is connected to the driving device through wires.

[0009] In the shaft-penetrating radial excitation automatic balancing device of the present application, the fan-shaped angle of the plug holder is 40-60°. The plug holder is fixed on the outer side of the moving ring shell between the two static ring shells, and maintains a gap of more than 2mm with the moving ring shell.

[0010] In the shaft-penetrating radial excitation automatic balancing device of the present application, the shaft-penetrating radial excitation automatic balancing device further comprises a bearing distance ring and an outer ring retainer. The bearing distance ring is fixed on the inner excitation ring between the moving ring bearing and the static ring bearing, and the two ends of the bearing distance ring abut against the inner rings of the moving ring bearing and the static ring bearing, respectively. The outer ring retainer is fixed on the excitation skeleton outside the inner ring nut retainer, and the outer ring retainer is fixed on the outer ring of the static ring bearing.

[0011] The automatic balancing device of the application, wherein the counterweight comprises a counterweight disc, an outer counterweight disc and an inner counterweight disc, the inner counterweight disc is arranged on the side of the counterweight disc between the counterweight disc and the inner excitation ring, and the outer counterweight disc is arranged on the side of the counterweight disc between the counterweight disc and the coil framework.

[0012] The automatic balancing device of the application, wherein the outer circumference of the inner excitation ring is uniformly provided with an even number of 2N outer teeth of the inner excitation ring, the inner circumference of the outer excitation ring is uniformly provided with an even number of 2N inner teeth of the outer excitation ring, the number of the inner teeth of the outer excitation ring is equal to that of the outer teeth of the inner excitation ring and corresponds to each other, the outer circumference of the counterweight disc extends into the inner teeth of the outer excitation ring and the outer teeth of the inner excitation ring, a plurality of holes are formed on the outer circumference of the counterweight disc, the plurality of holes are divided into a group of holes provided with permanent magnets and a group of holes provided with soft iron, the group of holes provided with permanent magnets and the group of holes provided with soft iron are arranged alternately along the outer circumference of the counterweight disc, and N is a natural number.

[0013] The automatic balancing device of the application, wherein the outer circumference of the inner excitation ring is uniformly provided with an even number of 2N outer teeth of the inner excitation ring, the inner circumference of the outer excitation ring is uniformly provided with an even number of 2N inner teeth of the outer excitation ring, the number of the inner teeth of the outer excitation ring is equal to that of the outer teeth of the inner excitation ring and corresponds to each other, the outer circumference of the counterweight disc extends into the inner teeth of the outer excitation ring and the outer teeth of the inner excitation ring, a plurality of holes are formed on the outer circumference of the counterweight disc, the plurality of holes are divided into a group of holes provided with permanent magnets and a group of holes provided with soft iron, the group of holes provided with permanent magnets and the group of holes provided with soft iron are arranged alternately along the outer circumference of the counterweight disc, and N is a natural number.

[0014] The automatic balancing device of the application, wherein a positioning magnet is arranged on the outer counterweight disc opposite to the positioning Hall element, and a reference magnet is arranged on the outer shell of the movable ring opposite to the reference Hall element.

[0015] The automatic balancing device of the application, wherein the coil framework is a stepped circular ring, a groove is formed on the circular ring, and the coil is wound in the groove.

[0016] The automatic balancing device of the application, wherein the outer excitation ring, the inner excitation ring, the excitation framework, the bearing distance ring, the inner ring nut retainer and the outer ring retainer are made of electrical soft iron material; the outer shell of the movable ring, the counterweight disc, the outer shell of the stationary ring, the plug-in framework and the pre-tightening flange are made of hard aluminum alloy material; and the outer counterweight disc and the inner counterweight disc are made of tungsten-copper alloy, brass, stainless steel or aluminum alloy material.

[0017] The automatic balancing device of the application is installed in the middle section of the rotor, and in the working process, the dynamic ring of the balancing device rotates with the rotor, the external measuring controller and driver supply pulse voltage to the coil, the annular magnetic field generated around magnetizes the excitation skeleton, the inner excitation ring, the outer excitation ring and other magnetic conductive components, forming an alternating magnetic field. The permanent magnets and soft iron on the counterweight disc are subjected to directional magnetic force under the action of the alternating magnetic field, and the counterweight disc is step-rotated relative to the rotor, and by adjusting the size of the included angle and the direction of the center line of the included angle of the two counterweight discs, the eccentric counterweight blocks thereon can form a compensation vector according to the unbalanced amplitude and phase of the rotor, so as to suppress the unbalanced vibration of the rotating machinery in line. The automatic balancing device of the application has the advantages of radial excitation structure without inner and outer excitation ring collision and small dynamic and static ring magnetic leakage, and improves the disadvantages of the complex installation mode and large space occupation of the end-mounted structure, reduces the installation difficulty of the radial excitation balancing device, improves the flexibility of the installation of the radial excitation balancing device, widens the application occasions of the balancing device, and has strong competitive advantage in the rotating machinery with small available space such as an aero-engine rotor. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 Fig. 1 is a radial section view of the automatic balancing device of the application;

[0019] Figure 2 Fig. 3 is a matching relationship diagram of the inner excitation ring, the outer excitation ring, the counterweight disc and the permanent magnets and soft iron thereon of the automatic balancing device of the application;

[0020] Figure 3 Fig. 5 is an enlarged analysis diagram of the local magnetic circuit of the automatic balancing device of the application;

[0021] Figure 4 Fig. 7 is a local force analysis diagram of the outer excitation ring, the inner excitation ring and the counterweight disc of the automatic balancing device of the application in the self-locking state;

[0022] Figure 5 Fig. 9 is a local force analysis diagram of the outer excitation ring, the inner excitation ring and the permanent magnets on the counterweight disc of the automatic balancing device of the application in the driving state when the counterweight disc is in the initial position;

[0023] Figure 6 Fig. 11 is a local force analysis diagram of the outer excitation ring, the inner excitation ring and the soft iron on the counterweight disc of the automatic balancing device of the application in the driving state when the counterweight disc is in the initial position;

[0024] Figures 1 to 6In the diagram, number 1 is the pre-tightening flange; number 2 is the expansion sleeve; number 3 is the inner excitation ring; number 4 is the inner ring nut retaining ring; number 5 is the outer ring retaining ring; number 6 is the excitation frame; number 7 is the coil frame; number 8 is the coil; number 9 is the reference Hall element; number 10 is the moving ring housing; number 11 is the reference magnet; number 12 is the stationary ring housing; number 13 is the aviation hole plug; number 14 is the aviation socket; number 15 is the outer excitation ring; number 16 is the permanent magnet; and so on. 17 is a positioning magnet; 18 is a positioning Hall element; 19 is a counterweight plate; 20 is an outer counterweight plate; 21 is an inner counterweight plate; 22 is a bearing spacer ring; 23 is a rotating machinery rotor; 24 is a stationary ring bearing; 25 is a moving ring bearing; 26 is soft iron; 27 is the inner tooth of the outer excitation ring; 28 is the outer tooth of the inner excitation ring; 29 is a drive device; 30 is a power supply device; 31 is a partition. Detailed Implementation

[0025] like Figure 1 As shown, the through-shaft radial excitation automatic balancing device of the present invention is mounted on the circumference of the rotating machinery rotor 23. It includes: a pre-tightening flange 1, a shrink sleeve 2, a rotating ring, a rotating ring housing 10, a stationary ring housing 12, a stationary ring, a flight hole plug 13, a flight plug frame 14, a measurement and control device 29, and a drive device 30. The rotating ring includes: an inner excitation ring 3, a counterweight, an outer excitation ring 15, a bearing spacer ring 22, and an outer ring retaining ring 5. The stationary ring includes: an inner ring nut retaining ring 4, an excitation frame 6, a coil frame 7, and a coil 8. The rotating ring housing 10 is a cylindrical tube with an annular partition 31 in the center. The rotating machinery rotor 23 passes through the axis of the rotating ring housing 10. A rotating ring is installed in the space enclosed by the partition 31, the rotating machinery rotor 23, and the rotating ring housing 10. The rotating machinery rotor 23 is located on the left and right sides of the partition 31. An inner excitation ring 3 is mounted on each of the inner excitation rings 3. The counterweight is mounted on the inner excitation ring 3 via the moving ring bearing 25. An outer excitation ring 15 is fixed on the circumference of the moving ring outer shell 10 on both sides of the partition plate 31. The bearing spacer ring 22 is fixed on the inner excitation ring 3 between the moving ring bearing 25 and the stationary ring bearing 24. Its two ends abut against the inner rings of the moving ring bearing 25 and the stationary ring bearing 24 respectively. An outer ring retainer ring 5 is fixed on the excitation frame 6 outside the inner ring nut retainer ring 4. The outer ring retainer ring 5 is fixed on the outer ring of the stationary ring bearing 24.

[0026] The rotating machine rotor 23 is a solid shaft, the outer ends of the two inner excitation rings 3 are fixed on the rotating machine rotor 23 through two expansion sleeves 2, the inner ends of the inner excitation rings 3 are located on the partition plates 31, the pre-tightening flanges 1 are respectively sleeved on the outer ends of the two expansion sleeves 2 of the rotating machine rotor 23, the pre-tightening flanges 1 are fixed on the inner excitation rings 3 through screws, the inner ring nut retainer ring 4 is threaded on the outer ends of the inner excitation rings 3, the static ring bearing 24 is arranged on the circumference of the inner excitation ring 3, the inner ring of the static ring bearing 24 is fixed on the inner ring nut retainer ring 4, the excitation skeletons 6 are arranged on the outer rings of the static ring bearing 24, the coil skeletons 7 are arranged on the excitation skeletons 6, the coil skeletons 7 face the counterweights, the coil skeletons 7 are stepped annular rings, grooves are formed in the annular rings, the coils 8 are wound in the grooves, the positioning Hall elements 18 are arranged on the coil skeletons 7, the reference Hall element 9 is arranged on the side of the excitation skeleton 6 facing the dynamic ring shell 10, two static ring shells 12 are respectively fixed on the outer circumferences of the two excitation skeletons 6, the fan-shaped plug-in shelves 14 are arranged on the outer sides of the two static ring shells 12 and the dynamic ring shell 10, the fan-shaped angle of the plug-in shelves 14 is 40-60°, the plug-in shelves 14 are fixed on the outer side of the dynamic ring shell 10 between the two static ring shells 12 and maintain a gap of more than 2mm from the dynamic ring shell 10, the two plug-in shelves 13 are fixed on the outer side of the plug-in shelves 14, the two positioning Hall elements 18 and the reference Hall element 9 are connected to one plug-in shelf 13 through wires, the plug-in shelf 13 is connected to the measurement and control device 29 through wires, the two coils 8 are connected to the other plug-in shelf 13 through wires, the plug-in shelf 13 is connected to the driving device 30 through wires. The positioning magnets 17 are arranged on the outer side counterweight disc 20 opposite to the positioning Hall elements 18, and the reference magnets 11 are arranged on the dynamic ring shell 10 opposite to the reference Hall element 9.

[0027] As shown in Figure 1 , the counterweight includes a counterweight disc 19, an outer side counterweight disc 20 and an inner side counterweight disc 21, the inner side counterweight disc 21 is arranged on the side of the counterweight disc 19 between the counterweight disc 19 and the inner excitation ring 3, and the outer side counterweight disc 20 is arranged on the side of the counterweight disc 19 between the counterweight disc 19 and the coil skeleton 7.

[0028] As shown in Figure 2As shown in the figure, there are even number 2N inner excitation ring outer teeth 28 evenly distributed on the outer circumference of the inner excitation ring 3, and even number 2N outer excitation ring inner teeth 27 evenly distributed on the inner circumference of the outer excitation ring 15, the number of outer excitation ring inner teeth 27 and inner excitation ring outer teeth 28 is equal, and they correspond to each other, wherein N is a natural number, the outer circumference of the counterweight disc 19 extends into the outer excitation ring inner teeth 27 and the inner excitation ring outer teeth 28, a plurality of holes are opened on the outer circumference of the counterweight disc 19, and the plurality of holes are divided into a hole group provided with permanent magnets 16 and a hole group provided with soft iron 26, and the hole group provided with permanent magnets 16 and the hole group provided with soft iron 26 are arranged along the outer circumference of the counterweight disc 19. Specifically, there are 24 outer excitation ring inner teeth 27 and 24 inner excitation ring outer teeth 28 evenly distributed on the inner circumferential surface of the outer excitation ring 15 and the outer circumferential surface of the inner excitation ring 3 respectively; the number of the hole group provided with permanent magnets 16 and the hole group provided with soft iron 26 is four respectively, the total number of holes in the hole group provided with permanent magnets 16 is 12, wherein the number of holes in two hole groups is 2, and the number of holes in the other two hole groups is 4, the above hole groups are distributed at intervals of 90°, and the adjacent holes in the hole group provided with permanent magnets 16 are separated by 7.5° on the circumference of the counterweight disc 19; the total number of holes in the hole group provided with soft iron 26 is 32, which is divided into four hole groups, and the number of holes in each hole group is 8, the adjacent holes in the hole group provided with soft iron 26 are separated by 7.5° on the circumference of the counterweight disc 19, and the adjacent holes provided with permanent magnets 16 and the holes provided with soft iron 26 are separated by 11.25° on the outer circumference of the counterweight disc 19, and the gap between the permanent magnets 16 and the soft iron 26 and the outer excitation ring inner teeth 27 and the inner excitation ring outer teeth 28 is within the range of 0.4mm~0.8mm.

[0029] The outer excitation ring 15, the inner excitation ring 3, the excitation block magnetic framework 6, the bearing distance ring 22, the inner ring nut retainer 4 and the outer ring retainer 5 are made of soft electrical iron material; the moving ring shell 10, the counterweight disc 19, the static ring shell 12, the flight support 14 and the pre-tightening flange 1 are made of hard aluminum alloy material; the outer counterweight disc 20 and the inner counterweight disc 21 are made of tungsten copper alloy, brass, stainless steel or aluminum alloy material.

[0030] In the working state, the moving ring rotates with the rotating machine rotor 23, and the static ring is stationary. The counterweight disc 19 in the moving ring has two motion states.

[0031] When the rotating machine rotor operates normally, the automatic balancing device does not act. The magnetic force acting on the counterweight disc 19 is as shown in the figure Figure 4 Under the action of this force, together with the inner excitation ring 3 and the outer excitation ring 15, it rotates with the rotating machine rotor 23, at this time, the counterweight disc 19 is in a self-locking state, and the force acting on it is a self-locking force.

[0032] As shown in the figure Figure 3As shown, when the unbalanced vibration of the rotating machinery rotor 23 exceeds the standard, the automatic balancing device starts automatic balancing. The measurement and control device 29 calculates the target positions of the two counterweight disks 19 based on the unbalanced amplitude and phase of the rotating machinery rotor 23. Then, the drive device 30 applies voltage to the coil 8 of the automatic balancing device, generating a ring magnetic field around it. First, the excitation frame 6 and the outer ring retainer 5 are magnetized. Then, the inner ring nut retainer 4, the bearing spacer ring 22, the inner excitation ring 3, and the outer excitation ring 15 are magnetized through the gap between the moving ring and the stationary ring. Finally, the magnetic lines of force pass through the gap between the excitation rings and converge at the permanent magnet 16 on the counterweight disk, forming a ring like... Figure 3 The diagram shows a closed, ring-shaped magnetic field. Under the influence of this magnetic field, the inner tooth 27 of the external excitation ring is magnetized into the N pole, and the outer tooth 28 of the internal excitation ring is magnetized into the S pole. At this time, the magnetic force between the two and the adjacent permanent magnet 16 is as follows: Figure 5 As shown, the combined force causes the counterweight disk 19 to rotate in a specific direction. At the same time, the magnetic forces between the magnetized inner teeth 27 and outer teeth 28 of the external excitation ring and the soft iron 26 are as follows: Figure 6 As shown, the three elements attract each other under magnetic force and are in a state of force equilibrium. However, when the counterweight disk 19 rotates in an directional manner, the equilibrium is broken, and the resultant force of the magnetic force on the soft iron 26 gradually increases, pulling the counterweight disk 19 to rotate in an directional manner. During this process, the counterweight disk is in a driving state, and the traction force it receives is the driving force. When the counterweight disk rotates to the middle position, the magnetized inner teeth 27 of the outer excitation ring and the outer teeth 28 of the inner excitation ring will generate a resultant force on the permanent magnet 16 in the opposite direction to the rotation of the counterweight disk 19, hindering its normal movement. Therefore, it is necessary to disconnect the voltage supplied to the coil 8 by the drive device 30, and the counterweight disk 19 moves to the next self-locking position by its own inertia, completing one cycle of regulation. Subsequently, the drive device 30 applies a reverse voltage to the coil 8, and the counterweight disk 19 continues to rotate counterclockwise. This process is repeated until both counterweight disks 19 rotate to the target position calculated by the measurement and control device 29. The resulting compensation vector will then precisely compensate for the eccentric mass that causes the rotor 23 to vibrate excessively, thereby suppressing the vibration of the rotating machinery rotor 23.

[0033] The through-shaft radial excitation automatic balancing device of the present invention is a significant improvement upon patent CN110829711B (Invention title: An electromagnetic slip ring type automatic balancing device with radial excitation structure). Its main innovations are as follows:

[0034] 1. In the device of the present invention, the rotor connection method has been changed from end-mounted flange connection to through-shaft expansion sleeve connection, which reduces the space required for installation of the device of the present invention, and enables the device of the present invention to be applied in occasions where the rotor space is smaller.

[0035] 2. To adapt to the wearing shaft type structure, the structure layout of the moving and static rings of the device and the connection mode between the moving and static rings are changed, so that the device is easier to install and disassemble, and the axial space of the device is saved.

[0036] 3. The position of the flag holder and the flag head outside the device is adjusted, so that the internal sensor and coil wiring are newly designed.

[0037] The balancing ability of the device of the present application is similar to that of the device of patent CN110829711B. Compared with the structure of the device of patent CN110829711B, the technical advantages brought by the structure of the device of the present application are obviously manifested in the driving voltage parameter. Ideally, the smaller the peak value of the driving voltage, the less the coil heating, the higher the driving efficiency of the balancing device, and the stronger the reliability. Therefore, the smaller the peak value of the driving voltage of the balancing device, the more advanced the structure design.

[0038] The balancing device driving step experiment of the device of patent CN110829711B and the device of the present application is carried out under four working conditions of static condition, experimental bench 1000r / min, experimental bench 1500r / min and experimental bench 2000r / min, and the obtained driving voltage parameters are shown in the following table.

[0039]

[0040] Comparing the driving voltage of the original device and the new device, the driving voltage under the four working conditions is obviously decreased, and the overall decrease is more than 43.4%, which shows that the structure design improvement of the new device has achieved a relatively significant technical effect.

[0041] The above-described embodiments only describe the preferred embodiments of the present application, and do not limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements to the technical solutions of the present application made by those skilled in the art shall fall within the protection scope determined by the claims of the present application.

Claims

1. A through-shaft radial excitation automatic balancing device, the through-shaft radial excitation automatic balancing device being mounted on the circumference of a rotating machinery rotor (23), comprising: The components include a pre-tightening flange (1), a shrink sleeve (2), a rotating ring, a rotating ring housing (10), a stationary ring housing (12), a stationary ring, an aviation hole plug (13), an aviation socket (14), a measurement and control device (29), and a drive device (30). The rotating ring includes an inner excitation ring (3), a counterweight, and an outer excitation ring (15). The stationary ring includes an inner ring nut retaining ring (4), an excitation frame (6), a coil frame (7), and a coil (8). The rotating ring housing (10) is a cylindrical tube with an annular partition (31) in the center. The rotating mechanical rotor (23) passes through the axis of the rotating ring housing (10). A rotating ring is installed in the space enclosed by the partition (31), the rotating mechanical rotor (23), and the rotating ring housing (10). An inner excitation ring (3) is installed on the rotating mechanical rotor (23) on the left and right sides of the partition (31). The counterweight passes through... A rotating ring bearing (25) is mounted on an inner excitation ring (3), and an outer excitation ring (15) is fixed on the circumference of the rotating ring housing (10) on both sides of the partition plate (31); characterized in that: the rotating mechanical rotor (23) is a solid shaft, the outer ends of the two inner excitation rings (3) are respectively fixed on the rotating mechanical rotor (23) by an expansion sleeve (2), the inner end of the inner excitation ring (3) rests on the partition plate (31), and a pre-tightening flange (1) is respectively fitted on the rotating mechanical rotor (23) at the outer ends of the two expansion sleeves (2), and the pre-tightening flange (1) is fixed on the inner excitation ring (3) by screws; inner ring nut The retaining ring (4) is threaded onto the outer end of the inner excitation ring (3). The stationary ring bearing (24) is mounted on the circumference of the inner excitation ring (3). The inner ring of the stationary ring bearing (24) is fixed on the inner ring nut retaining ring (4). The excitation frame (6) is mounted on the outer ring of the stationary ring bearing (24). A coil frame (7) is mounted on the excitation frame (6). The coil frame (7) faces the counterweight. A coil (8) is wound inside the coil frame (7). A positioning Hall element (18) is mounted on the coil frame (7). A reference Hall element (9) is mounted on the side of the excitation frame (6) facing the moving ring housing (10). Two stationary ring housings (12) are fixed on the outer circumference of the frame (6). A fan-shaped flight insertion frame (14) is installed on the outside of the two stationary ring housings (12) and the moving ring housing (10). Two flight hole plugs (13) are fixed on the outside of the flight insertion frame (14). Two positioning Hall elements (18) and a reference Hall element (9) are connected to one flight hole plug (13) through wires. The flight hole plug (13) is connected to the measurement and control device (29) through wires. Two coils (8) are connected to another flight hole plug (13) through wires. The flight hole plug (13) is connected to the drive device (30) through wires.

2. The through-shaft radial excitation automatic balancing device as described in claim 1, characterized in that: The fan angle of the aircraft mounting bracket (14) is 40 to 60°. It is fixed on the outside of the moving ring housing (10) between the two stationary ring housings (12) and maintains a gap of more than 2 mm with the moving ring housing (10).

3. The through-shaft radial excitation automatic balancing device as described in claim 2, characterized in that: It also includes: a bearing spacer ring (22) and an outer ring retainer ring (5). The bearing spacer ring (22) is fixed on the inner excitation ring (3) between the moving ring bearing (25) and the stationary ring bearing (24), and its two ends respectively press against the inner rings of the moving ring bearing (25) and the stationary ring bearing (24); an outer ring retainer ring (5) is fixed on the excitation frame (6) outside the inner ring nut retainer ring (4), and the outer ring retainer ring (5) is fixed on the outer ring of the stationary ring bearing (24).

4. The through-shaft radial excitation automatic balancing device as described in claim 3, characterized in that: The counterweights include: a counterweight plate (19), an outer counterweight plate (20), and an inner counterweight plate (21). The inner counterweight plate (21) is installed on the side of the counterweight plate (19) between the counterweight plate (19) and the inner excitation ring (3), and the outer counterweight plate (20) is installed on the side of the counterweight plate (19) between the counterweight plate (19) and the coil frame (7).

5. The through-shaft radial excitation automatic balancing device as described in claim 4, characterized in that: An even number (2N) of inner excitation ring outer teeth (28) are evenly distributed on the outer circumference of the inner excitation ring (3), and an even number (2N) of outer excitation ring inner teeth (27) are evenly distributed on the inner circumference of the outer excitation ring (15). The number of outer excitation ring inner teeth (27) and inner excitation ring outer teeth (28) are equal and correspond to each other. The outer circumference of the counterweight disk (19) extends between the outer excitation ring inner teeth (27) and inner excitation ring outer teeth (28). Several holes are opened on the outer circumference of the counterweight disk (19). The holes are divided into a group of holes containing permanent magnets (16) and a group of holes containing soft iron (26). The group of holes containing permanent magnets (16) and the group of holes containing soft iron (26) are arranged alternately along the outer circumference of the counterweight disk (19). N is a natural number.

6. The through-shaft radial excitation automatic balancing device as described in claim 5: characterized in that: There are 24 evenly distributed inner teeth (27) of the outer excitation ring (15) and 24 outer teeth (28) of the inner excitation ring (3) on the inner circumferential surface of the outer excitation ring (15). There are four groups of holes with permanent magnets (16) and four groups of holes with soft iron (26). The total number of holes in the groups with permanent magnets (16) is 12, of which two groups have 2 holes and the other two groups have 4 holes. The above groups of holes are distributed at 90° intervals. The adjacent holes in the groups with permanent magnets (16) are 7 cm apart on the circumference of the counterweight plate (19). 0.5°; The total number of holes in the hole group containing soft iron (26) is 32, which are divided into four hole groups, each with 8 holes. The adjacent holes in the hole group containing soft iron (26) are 7.5° apart on the circumference of the counterweight plate (19), and the adjacent holes containing permanent magnet (16) and soft iron (26) are 11.25° apart on the outer circumference of the counterweight plate (19). The gaps between the permanent magnet (16) and soft iron (26) and the inner teeth (27) of the outer excitation ring and the outer teeth (28) of the inner excitation ring are in the range of 0.4mm to 0.8mm.

7. The through-shaft radial excitation automatic balancing device as described in claim 6, characterized in that: A positioning magnet (17) is mounted on the outer counterweight plate (20) opposite to the positioning Hall element (18), and a reference magnet (11) is mounted on the moving ring housing (10) opposite to the reference Hall element (9).

8. The through-shaft radial excitation automatic balancing device as described in claim 7, characterized in that: The coil frame (7) is a stepped ring with a groove on it, and the coil (8) is wound in the groove.

9. The through-shaft radial excitation automatic balancing device as described in claim 8, characterized in that: The external excitation ring (15), internal excitation ring (3), excitation frame (6), bearing spacer ring (22), inner ring nut retainer (4) and outer ring retainer (5) are made of electrical soft iron material; the moving ring shell (10), counterweight plate (19), stationary ring shell (12), aircraft mounting frame (14) and pre-tightening flange (1) are made of hard aluminum alloy material; the outer counterweight plate (20) and inner counterweight plate (21) are made of tungsten copper alloy, brass, stainless steel or aluminum alloy material.

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