An air gap eccentricity adjustment device and adjustment method for a generator fault simulation unit

Abstract

The invention discloses an air gap eccentricity adjustment device and adjustment method for a generator fault simulation unit, which comprises: a lower end cover body, slide rails are fixed on both sides of the bottom of the lower end cover body, and an adjusting slider is slidably connected to the slide rails; an end frame, the end frames are grouped in pairs and are respectively fixedly connected to the two ends of the lower end cover body. A sliding hole is provided on the end frame, and a plurality of groups of mounting sleeves are slidably connected in the sliding hole, and the mounting sleeves adjust the moving position of the mounting sleeves on the end frame through nuts on the adjusting rod; a worm gear, the worm gear is multiple groups, and the two ends of the worm gear are respectively slidably connected in the mounting sleeve; a scale line is provided on the edge of one end of the worm gear, and the other end is connected to a hexagonal column head; the hexagonal column head is connected to a stator adjusting screw, and the stator adjusting screw is a hexagon socket screw, which is connected to the generator base; a rotating shaft, a plurality of worm gears are connected to the rotating shaft, and the worm gears are meshed with the worm gear in a one-to-one manner; the worm gear drives the worm gear to rotate and move axially; the rotation and axial movement of the worm gear causes the stator adjusting screw to push the generator stator to displace.

Description

Technical Field

[0001] The invention belongs to the technical field of generator fault simulation experiments, and in particular relates to an air gap eccentricity adjustment device and an adjustment method for a generator fault simulation unit. Background Art

[0002] During normal generator operation, the air gap between the stator and rotor is uniformly distributed. However, due to factors such as assembly errors and a deteriorating operating environment, it is difficult for the air gap between the stator and rotor to maintain a strictly uniform and symmetrical state. This condition is known as air gap eccentricity, and almost all generators experience air gap eccentricity to some extent. Air gap eccentricity is one of the main mechanical failures of generators. When an air gap eccentricity occurs in a generator, it generates unbalanced magnetic pull on the stator and rotor, deteriorating the working condition of the generator's bearings, increasing vibration of the generator's stator and rotor, and increasing motor losses, reducing energy conversion efficiency. In more serious cases, it can cause deformation of the stator core, winding wear, and insulation damage.

[0003] To study, monitor, and diagnose air gap eccentricity in generators, we need to investigate the changes in various electrical parameters during air gap eccentricity and analyze its impact on generator performance. Therefore, we need to simulate an air gap eccentricity fault in a generator unit. Traditional methods for adjusting air gap eccentricity are cumbersome and require considerable operator experience. They also suffer from two drawbacks: First, the adjustment accuracy is limited. The air gap of a small faulty generator unit typically ranges from 0.2 mm to 2 mm, and the eccentricity fault setting accuracy is at the millimeter level, making this difficult to achieve with traditional methods. Second, during the air gap adjustment process, traditional methods struggle to ensure the simultaneous movement of the two adjusting screws, typically adjusting them sequentially. This inevitably results in accuracy errors. This causes the two ends of the shaft to be off-plane, meaning the stator center axis cannot completely align with the rotor center axis, resulting in varying degrees of shaft misalignment along the entire axial direction, thus causing a so-called skew eccentricity fault. Skew eccentricity leads to inaccurate eccentricity fault setting, introducing unnecessary errors in subsequent simulations and experimental analysis.

[0004] At present, most of the air gap eccentricity setting devices for generator fault simulation units are based on traditional adjustment methods.

[0005] It is rare to be able to ensure that the two adjusting screws are moved synchronously to achieve the setting of the air gap eccentricity while maintaining sufficient adjustment accuracy.

[0006] Therefore, how to provide a device that can conveniently, quickly and accurately adjust the air gap eccentricity of the fault simulation unit is an urgent problem that needs to be solved by those skilled in the art. Summary of the Invention

[0007] In view of this, the present invention provides an air gap eccentricity adjustment device and adjustment method for a generator fault simulation unit. The device of the present invention is flexible and can cope with different types of generators, providing experimental support for the monitoring and research of generator air gap eccentricity faults.

[0008] In order to achieve the above object, the present invention adopts the following technical solution: an air gap eccentricity adjustment device for a generator fault simulation unit, which is used to adjust the stator position of the simulation unit to achieve air gap adjustment between the stator and rotor, and includes:

[0009] The lower end cover body is a U-shaped plate structure. Slide rails are fixed on both sides of the bottom of the lower end cover body. Adjustment sliders are slidably connected to the slide rails, and the adjustment sliders are connected to the generator base;

[0010] End frames, the end frames are grouped in pairs and are respectively fixedly connected to the two ends of the lower end cover body, the end frames are provided with sliding holes, the tops and bottoms of the end frames corresponding to the sliding holes are provided with sliding openings, multiple groups of mounting sleeves are slidably connected in the sliding holes, the tops and bottoms of the mounting sleeves are fixedly connected with adjustment rods, the adjustment rods are slidably connected in the sliding openings, and the movement position of the mounting sleeves on the end frames is adjusted by the nuts on the adjustment rods;

[0011] A worm, wherein the worm is in multiple groups, and each end edge of the worm is provided with a sliding section, and the sliding sections at both ends of the worm are respectively slidably connected to the mounting sleeve; a scale line is provided on the edge of one end of the worm, and the other end is connected to a hexagonal column head; the hexagonal column head is connected to the stator adjusting screw on the generator base, and the stator adjusting screw is a hexagon socket screw, which is screwed to the generator base; the end of the stator adjusting screw directly supports the support plate below the stator, and the support plate can move on the generator base;

[0012] A rotating shaft is rotatably connected to the two side walls of the lower end cover body, one end of the rotating shaft extends out of the side wall of the lower end cover body and is connected to a crank, a plurality of worm gears are connected to the rotating shaft, and the worm gears are meshed with the worm one by one; the worm gears drive the worm to rotate and move axially; the rotation and axial movement of the worm causes the stator adjusting screw to directly push the support plate, thereby causing the stator of the generator to displace, thereby changing the air gap between the stator and the rotor.

[0013] The beneficial effects of the present invention are as follows: the cooperation of the worm gear in the present invention enables the rotation of the crank handle to realize the rotation and axial movement of the worm, thereby causing the stator adjusting screw to rotate and move, pushing the position of the support plate below the stator to change, thereby changing the position of the stator, and realizing the adjustment of the air gap between the stator and the rotor of the simulated unit. The scale lines on the worm can accurately control the movement distance of the worm and control the advancement of the stator adjusting screw. The adjustment is flexible and convenient. The mounting sleeve can adjust its position in the slide groove to adapt to different generator models and sizes. It has strong versatility. Multiple worms can ensure the synchronous rotation of the two stator adjusting screws, avoiding the occurrence of oblique eccentricity during stator adjustment.

[0014] Preferably, the end frames each include two detachably connected separate bodies in a group, a mounting sleeve slide hole is provided on the separate bodies, grooves are provided on the top and bottom of the adjacent sides of the separate bodies in the group, and the grooves on the corresponding two separate bodies cooperate to form a sliding mouth, and the separate bodies in the group are connected by multiple groups of screws.

[0015] Preferably, the end frame close to the generator side is the front end frame, and the end frame away from the generator side is the rear end frame. The corresponding mounting sleeve on the front end frame is a straight pipe sleeve; the corresponding mounting sleeve on the rear end frame is a stepped sleeve, one end of the worm is stepped, and one end of the worm is adapted to be connected in the stepped sleeve.

[0016] Preferably, a keyway is provided on the outer side wall of the rotating shaft corresponding to its axial direction, and the keyway extends to the two end edges of the rotating shaft; a flat key is connected in the keyway, and the worm gear and the rotating shaft are connected and matched via the flat key.

[0017] Preferably, it further comprises an upper end cover, wherein the upper end cover adapter cover is arranged on the top of the lower end cover body.

[0018] Preferably, the worm wheel is a main action speed-increasing transmission, and the worm is a driven rod. The rotation of the worm wheel drives the rotation of the worm and the axial movement close to the generator side.

[0019] A method for adjusting air gap eccentricity of a generator fault simulation unit comprises the following steps:

[0020] Step 1: Fix the slider to the generator base or support frame according to the simulated eccentricity type of the generator;

[0021] Step 2: Install the two end brackets on the lower end cover with screws. A mounting sleeve is slidably connected in the slide groove of the end bracket. Slide the worm gear onto the mounting sleeve. Adjust the position of the mounting sleeve in the slide groove according to the size of the generator and tighten it with a nut. Ensure that the hexagonal column head is in good contact with the stator adjusting screw.

[0022] Step 3: Connect a worm wheel to the rotating shaft so that the worm wheel and the worm are meshed and transmitted. Turn the crank to drive the worm wheel, which in turn causes the worm to rotate and move axially. The worm pushes the stator adjusting screw to rotate, which in turn pushes the position of the support plate under the stator to adjust the position, changing the air gap between the stator and rotor. By observing the scale line on the worm, the offset distance of the worm can be accurately controlled, thereby achieving precise adjustment of the air gap eccentricity, and the entire adjustment process is completed.

[0023] The beneficial effect is that most current air gap eccentricity setting devices for generator fault simulation units are based on traditional adjustment methods, and few can ensure that two adjustment screws are moved synchronously to achieve air gap eccentricity while maintaining sufficient adjustment accuracy. However, the present invention can accurately adjust the air gap eccentricity of the fault simulation unit, making adjustment more convenient and quick. By observing the scale lines on the worm gear and accurately controlling the offset distance of the worm gear, the air gap eccentricity can be accurately adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of an air gap eccentricity adjustment device for a generator fault simulation unit according to the present invention;

[0025] Figure 2 This is an assembly diagram of an air gap eccentricity adjustment device for a generator fault simulation unit according to the present invention;

[0026] Figure 3 A top view of a simulated unit of an air gap eccentricity adjustment device of a generator fault simulation unit according to the present invention;

[0027] Figure 4 A side view of a simulated unit of an air gap eccentricity adjustment device of a generator fault simulation unit according to the present invention;

[0028] Figure 5 This is a schematic diagram of the rear end frame of an air gap eccentricity adjustment device of a generator fault simulation unit according to the present invention;

[0029] Figure 6 This is a schematic diagram of a front-end frame of an air gap eccentricity adjustment device for a generator fault simulation unit according to the present invention;

[0030] Figure 7 This is a schematic diagram of the lower end cover of an air gap eccentricity adjustment device of a generator fault simulation unit according to the present invention;

[0031] Figure 8 A schematic diagram of a worm gear of an air gap eccentricity adjustment device of a generator fault simulation unit according to the present invention;

[0032] Figure 9 This is a schematic diagram of the worm gear assembly of an air gap eccentricity adjustment device of a generator fault simulation unit of the present invention.

[0033] 1 lower end cover, 2 adjusting slider, 3 end frame, 4 sliding hole, 5 sliding mouth, 6 mounting sleeve, 7 worm, 8 worm wheel, 9 rotating shaft, 10 crank, 11 stator, 12 generator base, 13 upper end cover, 14 stator adjusting screw, 15 hexagonal column head, 16 slide rail, 17 adjusting rod, 18 rotor, 19 support plate. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] See the attached Figures 1 to 9 According to an embodiment of the present invention, an air gap eccentricity adjustment device for a generator fault simulation unit is provided, which is used to adjust the stator position of the simulated unit to achieve air gap adjustment between the stator and the rotor. The setting of the simulated generator unit can be driven by a DC motor to rotate a coupling rod. The two ends of the rotor rotate on two brackets. The coupling rod is connected to the rotor. The stator is located between the two brackets, and the adjustable position is located on the outer peripheral side of the rotor, simulating the working state of the generator unit.

[0036] It includes:

[0037] The lower end cover body 1 is a U-shaped plate structure. Slide rails 16 are fixed on both sides of the bottom of the lower end cover body 1. An adjustment slider 2 is slidably connected to the slide rail 16. The adjustment slider 2 is connected to the generator base 12; the purpose of the slider is to adapt to the installation and fixation of generator bases or brackets of different thicknesses, and it has strong versatility.

[0038] End frames 3 are grouped in pairs and are respectively fixedly connected to the two ends of the lower end cover body 1. Slide holes 4 are provided on the end frames 3. Slide openings 5 ​​are provided at the top and bottom of the end frames 3 corresponding to the slide holes 4. Two groups of mounting sleeves 6 are slidably connected in the slide holes 4. The top and bottom of the mounting sleeves 6 are fixedly connected to the adjusting rod 17. The adjusting rod 17 is slidably connected in the slide opening 5 and the moving position of the mounting sleeve on the end frame is adjusted by the nut on the adjusting rod;

[0039] There are two worms 7, and both end edges of the worm 7 are provided with sliding sections, and the sliding sections at both ends of the worm 7 are respectively slidably connected in the mounting sleeve 6; a scale line is provided on the edge of one end of the worm 7, and the other end is connected to a hexagonal column head 15; the hexagonal column head 15 is connected to the stator adjusting screw 14, and the stator adjusting screw 14 is a hexagonal screw, which is threadedly connected to the generator base 12; one end of the stator adjusting screw is in adaptive contact with the hexagonal column head, and the other end is in direct contact with the support plate 19 under the stator. The support plate can move on the generator base to change the air gap between the stator 11 and the rotor 18.

[0040] The rotating shaft 9 is rotatably connected to the two side walls of the lower end cover 1. One end of the rotating shaft 9 extends out of the side wall of the lower end cover 1 and is connected to a crank 10. Two worm gears 8 are connected to the rotating shaft 9, and the worm gears 8 mesh with the worm 7 in a one-to-one correspondence. The worm gears drive the worm to rotate and move axially. The rotation and axial movement of the worm causes the stator adjustment screw to push the generator stator 11 to move, thereby changing the air gap eccentricity adjustment of the stator and rotor.

[0041] In other embodiments, the end frame 3 comprises two detachably connected separate bodies in a set. Each separate body has a sliding hole for the mounting sleeve. The top and bottom of the adjacent sides of the separate body are each provided with a groove. The grooves on the corresponding two separate bodies cooperate to form a sliding opening. The separate bodies are connected by multiple sets of screws. This facilitates assembly and disassembly of the separate bodies and also facilitates assembly of the mounting sleeve.

[0042] In other embodiments, the end frame closer to the generator is the front frame, and the end frame farther from the generator is the rear frame. The mounting sleeve on the front frame is a straight sleeve, while the mounting sleeve on the rear frame is a stepped sleeve. One end of the worm 7 is stepped, and the other end of the worm is adapted to be connected within the stepped sleeve. The stepped sleeve can limit axial displacement of one end of the worm.

[0043] In other embodiments, a keyway is provided on the outer wall of the shaft 9, extending to both ends of the shaft. A flat key is connected to the keyway, and the worm gear is connected to the shaft via the flat key. The worm gear can be adjusted on the shaft to accommodate different worm gear positions and generators of different sizes.

[0044] Specifically, it also includes an upper end cover 13, which is adapted to be arranged on the top of the lower end cover body to effectively prevent dust.

[0045] In some other specific embodiments, the worm wheel is the main action speed-increasing transmission, and the worm is the driven rod. The rotation of the worm wheel drives the rotation of the worm and the axial movement close to the generator side. As applied here to the worm transmission, generally speaking, the worm transmission refers to the speed reduction transmission with the worm as the main action. The helix angle of the worm is very small, and the worm can only drive the worm wheel, while the worm wheel cannot drive the worm to rotate. Theoretically, there is basically no self-locking function when the lead angle is greater than 4°38′39″. Self-locking generally occurs in large speed ratios, such as 1:80. When the worm gear is not self-locking (related to the friction angle), rotating the worm wheel can also drive the worm to rotate, and the worm wheel is the main action speed-increasing transmission. That is, without self-locking, the worm wheel can drive the worm to rotate.

[0046] A method for adjusting air gap eccentricity of a generator fault simulation unit comprises the following steps:

[0047] Step 1: Fix the generator to the generator base or support frame according to the simulated eccentricity type of the generator;

[0048] Step 2: Install the two end brackets on the lower end cover with screws. A mounting sleeve is slidably connected in the slide groove of the end bracket. Slide the worm gear onto the mounting sleeve. Adjust the position of the mounting sleeve in the slide groove according to the size of the generator and tighten it with a nut. Ensure that the hexagonal column head is in good contact with the stator adjusting screw.

[0049] Step 3: Connect a worm wheel to the rotating shaft so that the worm wheel and the worm are meshed for transmission. The rotation of the crank drives the worm wheel to rotate, thereby causing the worm to rotate and move axially. The worm pushes the stator adjusting screw to rotate and adjust the position of the stator, thereby changing the air gap between the stator and rotor. By observing the scale line on the worm, the offset distance of the worm can be accurately controlled, thereby achieving precise adjustment of the air gap eccentricity.

[0050] The installation of the present invention's device differs slightly from that of various small generator fault simulators, requiring specific practical connection and subsequent adjustment of the air gap eccentricity. By adjusting the present invention's adjustment screws on the generator, both radial and axial eccentricity can be achieved.

[0051] The solution of the present invention is reliable and easy to implement, and can accurately meet the air gap eccentricity requirements of the generator fault simulation unit. In addition, the invented device is flexible and can cope with different types of generators, providing experimental guarantees for the study of generator eccentricity faults and is worthy of promotion.

[0052] As for the devices and methods of use disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the description of the methods.

[0053] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An air gap eccentricity adjustment device for a generator fault simulation unit, used to adjust the stator position of the simulation unit to achieve air gap adjustment between the stator and rotor, characterized in that: include: The lower end cover body is a U-shaped plate structure. Slide rails are fixed on both sides of the bottom of the lower end cover body. Adjustment sliders are slidably connected to the slide rails, and the adjustment sliders are connected to the generator base; The end frames are formed into groups of two and are respectively fixedly connected to the two ends of the lower end cover body, the end frames are provided with sliding holes, the tops and bottoms of the end frames corresponding to the sliding holes are provided with sliding openings, multiple groups of mounting sleeves are slidably connected in the sliding holes, the tops and bottoms of the mounting sleeves are fixedly connected with adjusting rods, the adjusting rods are slidably connected in the sliding openings and the moving position of the mounting sleeves on the end frames is adjusted by nuts on the adjusting rods; the end frames each include two separated bodies that are detachably connected in groups, the separated bodies are provided with mounting sleeve sliding holes, the tops and bottoms of the adjacent sides of the separated bodies in the group are provided with grooves, and the grooves on the corresponding two separated bodies cooperate to form a sliding opening; A worm, wherein the worm is in multiple groups, and each end edge of the worm is provided with a sliding section, and the sliding sections at both ends of the worm are respectively slidably connected to the mounting sleeve; a scale line is provided on one end edge of the worm, and the other end is connected to a hexagonal column head; the hexagonal column head is connected to the stator adjusting screw on the generator base, and the stator adjusting screw is a hexagon socket screw, and the stator adjusting screw directly supports the support plate below the stator, and the support plate can move on the generator base; A rotating shaft is rotatably connected to the two side walls of the lower end cover body, one end of the rotating shaft extends out of the side wall of the lower end cover body and is connected to a crank, a plurality of worm gears are connected to the rotating shaft, and the worm gears are meshed with the worm one by one; the worm gears drive the worm to rotate and move axially; the rotation and axial movement of the worm causes the stator adjusting screw to push the generator stator to displace.

2. The air gap eccentricity adjustment device of a generator fault simulation unit according to claim 1, characterized in that: The groups of separate bodies are connected by multiple sets of screws.

3. The air gap eccentricity adjustment device of a generator fault simulation unit according to claim 1, characterized in that: The end frame close to the generator side is the front end frame, and the end frame away from the generator side is the rear end frame. The corresponding mounting sleeve on the front end frame is a straight pipe sleeve; the corresponding mounting sleeve on the rear end frame is a stepped sleeve. One end of the worm is stepped, and one end of the worm is adapted to be connected in the stepped sleeve.

4. The air gap eccentricity adjustment device for a generator fault simulation unit according to claim 1, characterized in that: A keyway is provided on the outer side wall of the rotating shaft in the axial direction thereof, and the keyway extends to both end edges of the rotating shaft; a flat key is connected in the keyway, and the worm gear and the rotating shaft are connected and matched via the flat key.

5. The air gap eccentricity adjustment device for a generator fault simulation unit according to claim 1, characterized in that: It also includes an upper end cover, and the upper end cover adapter cover is arranged on the top of the lower end cover body.

6. The air gap eccentricity adjustment device for a generator fault simulation unit according to claim 1, characterized in that: The worm wheel is the main action speed-increasing transmission, and the worm is the driven rod. The rotation of the worm wheel drives the rotation of the worm and the axial movement of the worm close to the generator side.

7. A method for adjusting air gap eccentricity of a generator fault simulation unit according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1: Fix the slider to the generator base or support frame according to the simulated eccentricity type of the generator; Step 2: Install the two end brackets on the lower end cover with screws. A mounting sleeve is slidably connected in the slide groove of the end bracket. Slide the worm gear onto the mounting sleeve. Adjust the position of the mounting sleeve in the slide groove according to the size of the generator and tighten it with a nut. Ensure that the hexagonal column head is in good contact with the stator adjusting screw. Step 3: Connect a worm wheel to the rotating shaft so that the worm wheel and the worm are meshed for transmission. Adjust the crank to drive the worm wheel to rotate, causing the worm to rotate and move axially. The worm pushes the stator adjusting screw to rotate and then pushes the position of the support plate under the stator to adjust the position, changing the air gap between the stator and rotor. By observing the scale line on the worm, the offset distance of the worm can be accurately controlled to achieve precise adjustment of the air gap eccentricity. The entire adjustment process is completed.

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