Shaft penetrating type radial excitation automatic balancing device

Abstract

The shaft penetrating type radial excitation automatic balancing device is installed on the circumference of a rotating machine rotor and comprises a pre-tightening flange, an expansion sleeve, a movable ring, a movable ring shell, a static ring shell, a static ring, an aviation plug, an aviation plug frame, a measurement and control device and a driving device, the rotating machine rotor is a solid shaft, and the outer end of an inner excitation ring is fixed to the rotating machine rotor through the expansion sleeve; the inner end of the inner excitation ring abuts against the partition plate, the inner ring nut check ring is installed at the outer end of the inner excitation ring through threads, the static ring bearing is installed on the circumference of the inner excitation ring, the inner ring of the static ring bearing is fixed to the inner ring nut check ring, the excitation framework is installed on the outer ring of the static ring bearing, and static ring shells are fixed to the outer circumference of the static ring. An aviation plug frame is installed on the outer side of the static ring shell and the outer side of the movable ring shell, an aviation hole plug is fixed to the outer side of the aviation plug frame, the two positioning Hall elements and the reference Hall element are connected with one aviation plug through wires, and the two coils are connected with the other aviation plug through wires.

Description

Technical Field

[0001] The invention relates to a radial excitation automatic balancing device, in particular to a through-axis radial excitation automatic balancing device. Background Art

[0002] Excessive vibration of the rotor due to mass imbalance is one of the main reasons for failure of rotating machinery such as aircraft engines and high-end machine tools. During operation, prominent unbalanced vibration will lead to increased wear of rotating machinery parts, reduced operating efficiency, reduced service life, and reduced overall machine performance. The online automatic balancing device can achieve real-time vibration suppression during operation and is an effective measure to solve the failure of rotating machinery caused by excessive vibration.

[0003] According to the different ways in which the automatic balancing device drives the counterweight mass, it is usually divided into three types: gas-liquid type, motor type and electromagnetic type. Among them, the gas-liquid automatic balancing device has a simple structure and no moving parts. It is usually used in high-speed occasions. However, due to the difficulty of sealing, the liquid leakage caused by the attenuation of its balancing ability during use and the many auxiliary systems, it has not been widely used. The motor-type automatic balancing device is easy to install, has a fast balancing speed and high balancing accuracy. It occupies the vast majority of the automatic balancing market. However, the presence of gears, racks and other structures inside the device makes it have high requirements for processing accuracy and cost. At the same time, the internal motor power supply and signal need to be transmitted across the dynamic and static rings, which further increases the friction loss of the product and reduces the service life of the device. The electromagnetic slip ring type automatic balancing device was first proposed by Dyer S.W. and others of Blance Dynamics in the United States in 1998. The structure is divided into two parts: the dynamic ring and the static ring. The dynamic ring rotates with the rotor, and relies on the stepping of the internal counterweight disc to offset the mass imbalance of the rotor and suppress vibration; the static ring is wrapped with multiple turns of coils, and is connected to the external measurement and control device and power supply device to generate a magnetic field to drive the counterweight disc to step. The automatic balancing device is free from the limitation of complex mechanical structure, easy to install, simple balancing operation, fast balancing speed, no electrical signal transmission between moving and static rings, which reduces the processing difficulty and avoids the friction loss of components, thus prolonging the life of the device. At present, it has been studied and applied both at home and abroad.

[0004] Patent US2009 / 0306829Al discloses a propeller automatic balancing system capable of transient identification. The balancing system increases the recognition of transient signals, eliminates vibration signals generated by aircraft propellers during sudden changes in operating conditions such as takeoff and landing, and improves the reliability of the balancing system. However, the balancing device used in the system is a traditional axial excitation structure, with a large air gap between the dynamic and static rings, a large amount of internal magnetic field leakage, and a low overall balancing efficiency. Patent US8961140B2 discloses an automatic balancing system for aircraft propellers, wherein the automatic balancing device used can be installed in the root of the propeller by adding a slip ring structure, and the counterweight plate is equipped with 200 permanent magnets, with high balancing accuracy. However, the balancing device is still an axial excitation structure, which is limited by the air gap between the dynamic and static rings, and the balancing efficiency is not high. At the same time, the use of slip rings causes large wear of the components, which affects the life of the system. Patent CN101672342B discloses an automatic balancing device for high-speed rotating machinery. The balancing device converts electrical energy into mechanical energy through the inverse piezoelectric effect of piezoelectric ceramic sheets to achieve the driving effect on the counterweight plate. The counterweight plate can adjust its position up to 2,000 times per week, with high balancing accuracy. However, the energy conversion efficiency is low, and the balancing efficiency is also low. At the same time, the counterweight plate relies on friction to achieve self-locking, and the component loss is large, which affects the life of the device. Patent CN106768642B discloses a split automatic balancing device suitable for rotating machinery. The balancing device can be split and installed at the required position of the rotor. The installation method is flexible and suitable for in-service engines. However, the split structure makes the device have high requirements on processing and installation accuracy, high production cost, and the device is an axial excitation structure with low balancing efficiency. Patent CN110829711B discloses an electromagnetic slip ring automatic balancing device with a radial excitation structure. The balancing device is improved on the basis of the traditional axial excitation structure, and solves the problems of the yaw of the counterweight disc of the axial excitation structure during rotation and the friction with the excitation ring, as well as the high leakage magnetic field caused by the large air gap between the dynamic and static rings. At the same time, a permanent magnet electromagnetic combined drive structure is adopted to greatly improve the balancing efficiency of the balancing device. However, the device needs to be installed at the end of the rotor and a connecting flange needs to be reserved. The installation method is complicated and occupies a large space. It is difficult to use on rotating machinery such as aircraft engines.

[0005] Based on the existing radial excitation balancing device, the present invention designs a radial excitation balancing device that can be installed through the shaft, which improves the problems of complex installation method and large space occupation of the end-mounted structure, improves the flexibility of installation of the radial excitation balancing device, and broadens the application occasions of this balancing device. Summary of the invention

[0006] The purpose of the present invention is to improve the installation method of the existing radial excitation balancing device, broaden its application occasions, and provide a radial excitation balancing device that can be installed through a shaft.

[0007] In order to achieve the invention purpose of this application, this application adopts the following technical solutions: The present invention discloses a through-shaft radial excitation automatic balancing device, which is installed on the circumference of the rotor of a rotating machine, and comprises: a pre-tightening flange, a tightening sleeve, a dynamic ring, a dynamic ring housing, a static ring housing, a static ring, an aviation plug, an aviation plug bracket, a measurement and control device and a driving device. The moving ring includes: an inner excitation ring, a counterweight and an outer excitation ring; the static ring includes: an inner ring nut retaining ring, an excitation frame, a coil frame and a coil; the outer shell of the moving ring is a cylindrical tube, and there is a circular rib plate in the center of the cylindrical tube; the rotating mechanical rotor passes through the axis of the moving ring outer shell; a moving ring is respectively installed in the space surrounded by the rib plate, the rotating mechanical rotor and the moving ring outer shell; an inner excitation ring is respectively installed on the rotating mechanical rotor on the left and right sides of the partition; the counterweight is installed on the inner excitation ring through the moving ring bearing; an outer excitation ring is respectively fixed on the circumference of the moving ring outer shell on the left and right sides of the partition; wherein: the rotating mechanical rotor is a solid shaft, the outer ends of the two inner excitation rings are respectively fixed to the rotating mechanical rotor through a tightening sleeve, the inner end of the inner excitation ring rests on the partition, and pre-tightening flanges are respectively installed on the rotating mechanical rotor at the outer ends of the two tightening sleeves, and the pre-tightening flanges are fixed to the inner excitation ring by screws; the inner ring screw The female retaining ring is installed on the outer end of the inner excitation ring through a thread, 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 retaining ring, the excitation skeleton is installed on the outer ring of the static ring bearing, a coil skeleton is installed on the excitation skeleton, the coil skeleton faces the counterweight, a coil is wound inside the coil skeleton, a positioning Hall element is installed on the coil skeleton, a reference Hall element is installed on the side of the excitation skeleton facing the dynamic ring housing, two static ring housings are fixed on the outer circumferences of the two excitation skeletons, fan-shaped aviation plug racks are installed on the outer sides of the two static ring housings and the dynamic ring housing, two navigation hole plugs are fixed on the outer sides of the aviation plug racks, the two positioning Hall elements and the reference Hall element are connected to an aviation plug through wires, the aviation plug is connected to the measurement and control device through wires, the two coils are connected to another aviation plug through wires, and the navigation hole plug is connected to the drive device through wires.

[0008] The invention provides a through-axis radial excitation automatic balancing device, wherein: the fan angle of the aerial insert frame is 40-60 degrees, it is fixed on the outside of the dynamic ring shell between the two static ring shells, and maintains a gap of more than 2mm with the dynamic ring shell.

[0009] The present invention provides a through-axis radial excitation automatic balancing device, which further includes: a bearing distance ring and an outer ring retaining ring, wherein the bearing distance ring is fixed on the inner excitation ring between the moving ring bearing and the stationary ring bearing, and its two ends respectively support the inner rings of the moving ring bearing and the stationary ring bearing; an outer ring retaining ring is fixed on the excitation skeleton outside the inner ring nut retaining ring, and the outer ring retaining ring is fixed on the outer ring of the stationary ring bearing.

[0010] The present invention provides a through-axis radial excitation automatic balancing device, wherein: the counterweight includes: a counterweight disc, an outer counterweight block and an inner counterweight block, the inner counterweight block is installed on the counterweight disc side between the counterweight disc and the inner excitation ring, and the outer counterweight block is installed on the counterweight disc side between the counterweight disc and the coil frame.

[0011] The present invention provides a through-axis radial excitation automatic balancing device, wherein: an even number of 2N outer teeth of the inner excitation ring are evenly distributed on the outer circumference of the outer excitation ring, an even number of 2N inner teeth of the outer excitation ring are evenly distributed on the inner circumference of the outer excitation ring, the number of the outer excitation ring inner teeth is equal to that of the inner excitation ring outer teeth, and they correspond to each other, the outer circumference of the counterweight plate extends between the outer excitation ring inner teeth and the inner excitation ring outer teeth, a plurality of holes are opened on the outer circumference of the counterweight plate, the plurality of holes are divided into a hole group equipped with permanent magnets and a hole group equipped with soft iron, the hole group equipped with permanent magnets and the hole group equipped with soft iron are alternately arranged in sequence along the outer circumference of the counterweight plate, and N is a natural number.

[0012] The present invention provides a through-axis radial excitation automatic balancing device, wherein: 24 evenly distributed outer excitation ring inner teeth and 24 inner excitation ring outer teeth are respectively provided on the inner circumferential surface of the outer excitation ring and the outer circumferential surface of the inner excitation ring; there are four hole groups equipped with permanent magnets and four hole groups equipped with soft iron, and the total number of holes in the hole groups equipped with permanent magnets is 12, of which the number of holes in two groups of holes is 2, and the number of holes in the other two groups of holes is 4, the above-mentioned hole groups are distributed at 90° intervals, and adjacent holes in the hole groups equipped with permanent magnets are arranged on the circumference of the counterweight plate. 7.5° apart; the total number of holes in the hole group equipped with soft iron is 32, which are divided into four hole groups, each hole group has 8 holes, the adjacent holes in the hole group equipped with soft iron are 7.5° apart on the circumference of the counterweight disk, and the adjacent holes equipped with permanent magnets and holes equipped with soft iron are 11.25° apart on the outer circumference of the counterweight disk, and the gaps between the permanent magnets and the soft iron and the inner teeth of the outer excitation ring and the outer teeth of the inner excitation ring are in the range of 0.4mm~0.8mm respectively.

[0013] The present invention provides a through-axis radial excitation automatic balancing device, wherein: a positioning magnet is installed on the outer counterweight block opposite to the positioning Hall element, and a reference magnet is installed on the moving ring housing opposite to the reference Hall element.

[0014] The invention discloses a through-axis radial excitation automatic balancing device, wherein: the coil skeleton is a stepped circular ring, the circular ring is provided with a groove, and the coil is wound in the groove.

[0015] The present invention provides a through-axis radial excitation automatic balancing device, wherein: the outer excitation ring, the inner excitation ring, the excitation frame, the bearing distance ring, the inner ring retaining ring nut and the outer ring retaining ring are made of electrical soft iron material; the dynamic ring housing, the counterweight plate, the static ring housing, the aviation plug-in frame and the pre-tightening flange are made of hard aluminum alloy material; the outer counterweight block and the inner counterweight block are made of tungsten-copper alloy, brass, stainless steel or aluminum alloy material.

[0016] The through-axis radial excitation automatic balancing device of the present invention is installed in the middle section of the rotor. During operation, the dynamic ring of the balancing device rotates with the rotor, and the external measurement and control device and the driver pass a pulse voltage to the coil. The annular magnetic field generated around it magnetizes the excitation skeleton, the inner excitation ring, the outer excitation ring and other magnetic conductive components to form an alternating magnetic field. The permanent magnet and the soft iron on the counterweight disk are subjected to a directional magnetic force under the action of the alternating magnetic field, pulling the counterweight disk to step and rotate relative to the rotor. By adjusting the angle between the two counterweight disks and the direction of the center line of the angle, the eccentric counterweight block on it can form a compensation vector according to the unbalanced amplitude and phase of the rotor, and suppress the unbalanced vibration of the rotating machinery online. The through-axis radial excitation automatic balancing device described in the present invention has the advantages of a radial excitation structure without friction between the inner and outer excitation rings and small magnetic leakage between the dynamic and static rings, while improving the disadvantages of the end-mounted structure, such as complex installation and large space occupation, reducing the difficulty of installing the radial excitation balancing device, improving the flexibility of installing the radial excitation balancing device, and broadening the application occasions of this type of balancing device. It has a strong competitive advantage in rotating machinery with narrow available rotor space such as aircraft engines. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a radial cross-sectional schematic diagram of the through-axis radial excitation automatic balancing device of the present invention; Figure 2 A diagram showing the matching relationship between the inner excitation ring, the outer excitation ring, the counterweight plate and the permanent magnet soft iron thereon of the through-axis radial excitation automatic balancing device of the present invention; Figure 3 It is an enlarged analysis diagram of a local magnetic circuit of the through-axis radial excitation automatic balancing device of the present invention; Figure 4 The local force analysis diagram of the outer excitation ring, the inner excitation ring and the counterweight plate when the through-axis radial excitation automatic balancing device of the present invention is in the self-locking state; Figure 5 This is a local force analysis diagram of the permanent magnets on the outer excitation ring, the inner excitation ring and the counterweight disc when the through-axis radial excitation automatic balancing device of the present invention is in a driving state and the counterweight disc is in an initial position; Figure 6 It is a local force analysis diagram of the soft iron on the outer excitation ring, the inner excitation ring and the counterweight plate when the through-axis radial excitation automatic balancing device of the present invention is in the driving state and the counterweight plate is in the initial position; Figures 1 to 6 In the figure, 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 skeleton; number 7 is the coil skeleton; number 8 is the coil; number 9 is the reference Hall element; number 10 is the dynamic ring housing; number 11 is the reference magnet; number 12 is the static ring housing; number 13 is the navigation hole plug; number 14 is the navigation plug bracket; number 15 is the outer excitation ring; number 16 is the permanent magnet; number 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 distance ring; 23 is a rotating mechanical rotor; 24 is a stationary ring bearing; 25 is a dynamic ring bearing; 26 is soft iron; 27 is an inner tooth of an outer excitation ring; 28 is an outer tooth of an inner excitation ring; 29 is a driving device; 30 is a power supply device; 31 is a partition. DETAILED DESCRIPTION

[0018] like Figure 1 As shown, the through-axis radial excitation automatic balancing device of the present invention is installed on the circumference of the rotating mechanical rotor 23, and it includes: a pre-tightening flange 1, a tightening sleeve 2, a dynamic ring, a dynamic ring housing 10, a static ring housing 12, a static ring, an aviation plug 13, an aviation plug frame 14, a measurement and control device 29 and a driving device 30. The dynamic ring includes: an inner excitation ring 3, a counterweight, an outer excitation ring 15, a bearing distance ring 22 and an outer ring retaining ring 5; the static ring includes: an inner ring nut retaining ring 4, an excitation skeleton 6, a coil skeleton 7 and a coil 8. The dynamic ring housing 10 is a cylindrical tube, and a circular ring-shaped rib plate 31 is provided in the center of the cylindrical tube. The rotating mechanical rotor 23 passes through the axis of the dynamic ring housing 10. A dynamic ring is respectively provided in the space surrounded by the rib plate 31, the rotating mechanical rotor 23 and the dynamic ring housing 10. The rotating mechanical rotor 23 on the left and right sides of the partition 31 is provided with a dynamic ring. An inner excitation ring 3 is respectively installed on the inner excitation ring 3, and the counterweight is installed on the inner excitation ring 3 through the movable ring bearing 25. An outer excitation ring 15 is fixed on the circumference of the movable ring housing 10 on the left and right sides of the partition 31. The bearing spacing ring 22 is fixed on the inner excitation ring 3 between the movable ring bearing 25 and the stationary ring bearing 24, and its two ends respectively support the inner rings of the movable ring bearing 25 and the stationary ring bearing 24; an outer ring retaining ring 5 is fixed on the excitation skeleton 6 outside the inner ring nut retaining ring 4, and the outer ring retaining ring 5 is fixed on the outer ring of the stationary ring bearing 24.

[0019] The rotating mechanical rotor 23 is a solid shaft. The outer ends of the two inner excitation rings 3 are fixed on the rotating mechanical rotor 23 through a clamping sleeve 2 respectively. The inner ends of the inner excitation rings 3 lean against the partition 31. Pre-tightening flanges 1 are respectively mounted on the rotating mechanical rotor 23 at the outer ends of the two clamping sleeves 2. The pre-tightening flanges 1 are fixed to the inner excitation ring 3 through screws; the inner ring nut retaining ring 4 is threadedly mounted on 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 skeleton 6 is mounted on the outer ring of the stationary ring bearing 24, the coil skeleton 7 is mounted on the excitation skeleton 6, the coil skeleton 7 faces the counterweight, the coil skeleton 7 is a stepped ring, the ring is provided with a groove, the coil 8 is wound in the groove, and a positioning Hall element 18 is mounted on the coil skeleton 7. A reference Hall element 9 is installed on the side of the excitation skeleton 6 facing the dynamic ring housing 10. Two stationary ring housings 12 are fixed on the outer circumferences of the two excitation skeletons 6. A fan-shaped aviation plug-in frame 14 is installed on the outside of the two stationary ring housings 12 and the dynamic ring housing 10. The fan-shaped angle of the aviation plug-in frame 14 is 40-60 degrees. It is fixed on the outside of the dynamic ring housing 10 between the two stationary ring housings 12 and keeps a gap of more than 2mm with the dynamic ring housing 10. Two navigation hole plugs 13 are fixed on the outside of the aviation plug-in frame 14. Two positioning Hall elements 18 and the reference Hall element 9 are connected to an aviation plug 13 through wires. The aviation plug 13 is connected to the measurement and control device 29 through wires. The two coils 8 are connected to another aviation plug 13 through wires. The navigation hole plug 13 is connected to the drive device 30 through wires. A positioning magnet 17 is installed on the outer counterweight block 20 opposite to the positioning Hall element 18, and a reference magnet 11 is installed on the dynamic ring housing 10 opposite to the reference Hall element 19.

[0020] like Figure 1 As shown, the counterweight includes: a counterweight disc 19, an outer counterweight block 20 and an inner counterweight block 21. The inner counterweight block 21 is installed on the side of the counterweight disc 19 between the counterweight disc 19 and the inner excitation ring 3, and the outer counterweight block 20 is installed on the side of the counterweight disc 19 between the counterweight disc 19 and the coil frame 7.

[0021] like Figure 2As shown, an even number 2N of inner excitation ring outer teeth 28 are evenly distributed on the outer circumference of the outer 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 is equal to that of inner excitation ring outer teeth 28 and corresponds to each other, wherein N is a natural number, and the outer circumference of the counterweight plate 19 extends between 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 plate 19, and the plurality of holes are divided into a hole group equipped with permanent magnets 16 and a hole group equipped with soft iron 26. The hole group equipped with permanent magnets 16 and the hole group equipped with soft iron 26 are arranged alternately in sequence along the outer circumference of the counterweight plate 19. Specifically, there are 24 evenly distributed outer excitation ring inner teeth 27 and 24 inner excitation ring outer teeth 28 on the inner circumference of the outer excitation ring 15 and the outer circumference of the inner excitation ring 3 respectively; there are four hole groups equipped with permanent magnets 16 and four hole groups equipped with soft iron 26 respectively, and the total number of holes in the hole groups equipped with permanent magnets 16 is 12, of which the number of holes in two hole groups is 2, and the number of holes in the other two hole groups is 4, and the above hole groups are distributed at 90° intervals, and the adjacent holes in the hole groups equipped with permanent magnets 16 are on the circumference of the counterweight plate 19. 7.5° apart; the total number of holes in the hole group equipped with soft iron 26 is 32, which are divided into four hole groups, each hole group has 8 holes, and the adjacent holes in the hole group equipped with soft iron 26 are 7.5° apart on the circumference of the counterweight disk 19, and the adjacent holes equipped with permanent magnets 16 and the holes equipped with soft iron 26 are 11.25° apart on the outer circumference of the counterweight disk 19. The gaps between the permanent magnets 16 and the 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~0.8mm respectively.

[0022] The outer excitation ring 15, the inner excitation ring 3, the excitation frame 6, the bearing distance ring 22, the inner ring retaining ring nut 4 and the outer ring retaining ring 5 are made of electrical soft iron material; the dynamic ring housing 10, the counterweight plate 19, the static ring housing 12, the aviation bracket 14 and the pre-tightening flange 1 are made of hard aluminum alloy material; the outer counterweight block 20 and the inner counterweight block 21 are made of tungsten-copper alloy, brass, stainless steel or aluminum alloy material.

[0023] In the working state, the moving ring rotates with the rotating mechanical rotor 23, and the stationary ring is stationary. The counterweight plate 19 in the moving ring has two motion states.

[0024] When the rotor of the rotating machine is in normal operation, the automatic balancing device does not operate. Figure 4 As shown, under the action of this force, the counterweight plate 19 rotates together with the inner excitation ring 3 and the outer excitation ring 15 along with the rotary machine rotor 23. At this time, the counterweight plate 19 is in a self-locking state, and the force it is subjected to is a self-locking force.

[0025] like 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 position of the two counterweight discs 19 according to the unbalanced amplitude and phase of the rotating machinery rotor 23, and then the driving device 30 supplies voltage to the coil 8 of the automatic balancing device, and a circular magnetic field is generated around it. First, the excitation skeleton 6 and the outer ring retaining ring 5 are magnetized, and then the inner ring nut retaining ring 4, the bearing distance ring 22, the inner excitation ring 3 and the outer excitation ring 15 are magnetized through the gap between the moving ring and the static 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 disc, forming a magnetic field as shown in the figure. Figure 3 Under the action of this magnetic field, the inner teeth 27 of the outer excitation ring are magnetized to the N pole, and the outer teeth 28 of the inner excitation ring are magnetized to 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 in FIG. 1 , the resultant force pulls the counterweight plate 19 to rotate in a directional manner. At the same time, the magnetic force between the magnetized outer excitation ring inner teeth 27 and the inner excitation ring outer teeth 28 and the soft iron 26 is as shown in FIG. Figure 6 As shown, the three attract each other under the action of magnetic force and are in a state of force balance. However, when the counterweight disc 19 rotates in a certain direction, the balance state is broken, and the resultant force of the soft iron 26 under the action of magnetic force gradually increases, pulling the counterweight disc 19 to rotate in a certain direction. In this process, the counterweight disc is in a driving state, and the traction force it receives is the driving force. When the counterweight disc 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 of the rotation direction of the counterweight disc 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 disc 19 moves to the next self-locking position by its own inertia to complete a cycle of regulation. Subsequently, the driving device 30 supplies an opposite voltage to the coil 8, and the counterweight disc 19 will continue to rotate in the counterclockwise direction, and this cycle will be repeated until both counterweight discs 19 rotate to the target position calculated by the measurement and control device 29. The resulting compensation vector will then exactly compensate for the eccentric mass that causes the rotor 23 to vibrate excessively, thereby achieving vibration suppression of the rotating machinery rotor 23.

[0026] The through-axis radial excitation automatic balancing device of the present invention is a major improvement on the patent CN110829711B (invention name: an electromagnetic slip ring type automatic balancing device with radial excitation structure). Its main innovations are as follows: 1. The connection mode of the rotor in the device of the present invention is changed from end-mounted flange connection to through-shaft expansion sleeve connection, which reduces the space required for the installation of the device of the present invention, so that the device of the present invention can be used in occasions with smaller rotor space.

[0027] 2. To adapt to the through-shaft structure, the structural layout of the dynamic and static rings of the device of the present invention and the connection method between the dynamic and static rings are changed, making the device of the present invention easier to install and disassemble, while saving the axial space of the device of the present invention.

[0028] 3. The positions of the external aviation plug bracket and the aviation plug of the device of the present invention have been adjusted, so the internal sensor and coil routing have a new design.

[0029] The device of patent CN110829711B has similar balancing capabilities to the device of the present invention. Compared with the structure of the device of patent CN110829711B, the technical advantages brought by the structure of the device of the present invention are clearly reflected in the driving voltage parameters. Ideally, the smaller the peak value of the driving voltage, the less the coil heats up, the higher the driving efficiency of the balancing device, and the stronger the reliability. Therefore, the balancing device with a smaller driving voltage peak value has a more advanced structural design.

[0030] The device of patent CN110829711B and the device of the present invention were subjected to the balancing device driving step test under four working conditions: static condition, test bench 1000r / min, test bench 1500r / min and test bench 2000r / min, and the obtained driving voltage parameters are shown in the following table.

[0031]

[0032] Comparing the driving voltage of the original device and the new device, the driving voltage under the four working conditions has dropped significantly, with an overall decrease of more than 43.4%, indicating that the structural design improvement of the new device has achieved relatively significant technical effects.

[0033] The embodiments described above are merely descriptions of preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A through-axis radial excitation automatic balancing device, the through-axis radial excitation automatic balancing device is installed on the circumference of a rotor (23) of a rotating machine, comprising: A pre-tightening flange (1), a tightening sleeve (2), a moving ring, a moving ring housing (10), a stationary ring housing (12), a stationary ring, an aviation plug (13), an aviation plug frame (14), a measurement and control device (29) and a driving device (30). The moving 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 moving ring housing (10) is a cylindrical tube, and a circular rib plate (31) is provided at the center of the cylindrical tube. The rotating mechanical rotor (23) passes through the axis of the moving ring housing (10). A moving ring is respectively provided in the space surrounded by the rib plate (31), the rotating mechanical rotor (23) and the moving ring housing (10). An inner excitation ring (3) is respectively provided on the rotating mechanical rotor (23) on the left and right sides of the partition plate (31). The counterweight is provided through the inner ring nut retaining ring (4), an excitation frame (6), a coil frame (7) and a coil (8). A moving ring bearing (25) is mounted on an inner excitation ring (3), and an outer excitation ring (15) is fixed on the circumference of the moving ring housing (10) on the left and right sides of the partition (31); the characteristic is that: the rotating mechanical rotor (23) is a solid shaft, the outer ends of the two inner excitation rings (3) are fixed to the rotating mechanical rotor (23) through a tightening sleeve (2), the inner ends of the inner excitation rings (3) are against the partition (31), and pre-tightening flanges (1) are respectively mounted on the rotating mechanical rotor (23) at the outer ends of the two tightening sleeves (2), and the pre-tightening flanges (1) are fixed to the inner excitation ring (3) through screws; the inner ring nut The retaining ring (4) is installed on the outer end of the inner excitation ring (3) through a thread, the stationary ring bearing (24) is installed 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 installed on the outer ring of the stationary ring bearing (24), a coil frame (7) is installed 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 installed on the coil frame (7), a reference Hall element (9) is installed on the side of the excitation frame (6) facing the moving ring housing (10), and a Hall element (18) is installed on the two excitation frames. Two stationary ring housings (12) are fixed on the outer circumference of the frame (6), and a fan-shaped aviation plug frame (14) is installed on the outer sides of the two stationary ring housings (12) and the dynamic ring housing (10). Two navigation hole plugs (13) are fixed on the outer sides of the aviation plug frame (14). Two positioning Hall elements (18) and a reference Hall element (9) are connected to an aviation plug (13) through wires. The aviation plug (13) is connected to a measurement and control device (29) through wires. The two coils (8) are connected to another aviation plug (13) through wires. The navigation hole plug (13) is connected to a drive device (30) through wires.

2. The through-axis radial excitation automatic balancing device according to claim 1, characterized in that: The fan-shaped angle of the aerial insert frame (14) is 40-60 degrees. It is fixed on the outside of the dynamic ring housing (10) between the two static ring housings (12) and maintains a gap of more than 2 mm with the dynamic ring housing (10).

3. A through-axis radial excitation automatic balancing device as claimed in claim 2, characterized in that: It also includes: a bearing distance ring (22) and an outer ring retaining ring (5), wherein the bearing distance ring (22) is fixed on an inner excitation ring (3) between a moving ring bearing (25) and a stationary ring bearing (24), and its two ends respectively support the inner rings of the moving ring bearing (25) and the stationary ring bearing (24); an outer ring retaining ring (5) is fixed on an excitation frame (6) outside the inner ring nut retaining ring (4), and the outer ring retaining ring (5) is fixed on the outer ring of the stationary ring bearing (24).

4. A through-axis radial excitation automatic balancing device as claimed in claim 3, characterized in that: The counterweight comprises a counterweight disc (19), an outer counterweight block (20) and an inner counterweight block (21), wherein the inner counterweight block (21) is mounted on the counterweight disc (19) side between the counterweight disc (19) and the inner excitation ring (3), and the outer counterweight block (20) is mounted on the counterweight disc (19) side between the counterweight disc (19) and the coil frame (7).

5. A through-axis radial excitation automatic balancing device as claimed 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 outer 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 the outer excitation ring inner teeth (27) and the inner excitation ring outer teeth (28) are equal and correspond to each other. The outer circumference of the counterweight plate (19) extends between 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 plate (19). The plurality of holes are divided into a hole group equipped with permanent magnets (16) and a hole group equipped with soft iron (26). The hole group equipped with permanent magnets (16) and the hole group equipped with soft iron (26) are arranged alternately in sequence along the outer circumference of the counterweight plate (19), and N is a natural number.

6. A through-axis radial excitation automatic balancing device as claimed in claim 5, characterized in that: The inner circumferential surface of the outer excitation ring (15) and the outer circumferential surface of the inner excitation ring (3) are respectively provided with 24 evenly distributed outer excitation ring internal teeth (27) and 24 evenly distributed inner excitation ring external teeth (28); the number of the hole groups equipped with the permanent magnets (16) and the number of the hole groups equipped with the soft iron (26) are respectively four, the total number of holes in the hole groups equipped with the permanent magnets (16) is 12, of which the number of holes in two groups of hole groups is 2, and the number of holes in the other two groups of hole groups is 4, the above-mentioned hole groups are distributed at intervals of 90 degrees, and the adjacent holes in the hole groups equipped with the permanent magnets (16) are spaced apart on the circumference of the counterweight plate (19) by 1 / 4. 7.5°; the total number of holes in the hole group equipped with soft iron (26) is 32, which are divided into four hole groups, each hole group has 8 holes, adjacent holes in the hole group equipped with soft iron (26) are 7.5° apart on the circumference of the counterweight plate (19), adjacent holes equipped with permanent magnets (16) and holes equipped with soft iron (26) are 11.25° apart on the outer circumference of the counterweight plate (19), and the gaps between the permanent magnets (16) and the 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~0.8mm.

7. A through-axis radial excitation automatic balancing device as claimed in claim 6, characterized in that: A positioning magnet (17) is mounted on the outer counterweight (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 (19).

8. The through-axis radial excitation automatic balancing device according to claim 7, characterized in that: The coil frame (7) is a stepped circular ring with a groove formed on the circular ring, and the coil (8) is wound in the groove.

9. The radial excitation electromagnetic slip ring type automatic balancing device as claimed in claim 8, characterized in that: The outer excitation ring (15), the inner excitation ring (3), the excitation frame (6), the bearing distance ring (22), the inner ring retaining ring nut (4) and the outer ring retaining ring (5) are made of electrical soft iron material; the dynamic ring housing (10), the counterweight plate (19), the static ring housing (12), the flight bracket (14) and the pre-tightening flange (1) are made of hard aluminum alloy material; the outer counterweight block (20) and the inner counterweight block (21) are made of tungsten copper alloy, brass, stainless steel or aluminum alloy material.

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