Generator locked-rotor device and locked-rotor test method

Abstract

The invention discloses a generator locked-rotor device and a locked-rotor test method. The generator locked-rotor device comprises a base, a first lower sliding block, a second lower sliding block, a first bidirectional lead screw, a fixing plate, a first upper sliding block, a second upper sliding block, a second bidirectional lead screw, an upper nut, a lower nut, a lifting telescopic cylinder, a supporting plate and two parallel screws. The test method comprises the steps that a rotating shaft of a generator to be tested extends into a space defined by the four sliding blocks; the upper nut and the lower nut are screwed to enable the fixing plate to descend, and the two corresponding sliding blocks are driven to descend; the supporting plate is controlled to ascend through the lifting telescopic cylinder, and the two corresponding sliding blocks are driven to ascend till all the sliding blocks make contact with the rotating shaft of the generator. A first two-way screw rod is screwed to adjust the distance between a first lower sliding block and a second lower sliding block, meanwhile, a second two-way screw rod is screwed to adjust the distance between a first upper sliding block and a second upper sliding block, finally, the four sliding blocks are matched with one another to clamp the rotating shaft of the generator, and it is guaranteed that the rotating shaft is fixed; electrifying the stator of the generator, and observing whether the generator is damaged or not.

Description

Technical field:

[0001] The present invention relates to the technical field of generators, and in particular to a generator blocking device and a blocking test method. Background technology:

[0002] Wind turbines must undergo performance testing and fault analysis before leaving the factory. Among them, the stall test is one of the important performance tests. The stall test of the generator is to energize the stator of the generator for 40 seconds, keep the generator shaft from rotating, so that the generator's electrical energy is not converted into kinetic energy, the current increases, and observe whether the generator is damaged.

[0003] At present, the stall test of the generator is to hook the soft belt with the hook of the overhead crane, and use the soft belt to clamp the generator shaft to keep the generator from rotating, so as to achieve the purpose of the stall test. However, for large generators, it is difficult for the overhead crane to effectively limit the rotation of the generator shaft, and the stall test experiment cannot be carried out accurately. Summary of the invention:

[0004] The first object of the present invention is to provide a generator stalling device, which solves the problem that the existing generator stalling equipment has limitations and cannot limit the rotation of the shaft of a large generator.

[0005] The second object of the present invention is to provide a generator stall test method, which solves the problem that the current generator stall method cannot perform stall test on large motors.

[0006] The first object of the present invention is implemented by the following technical solution: a generator stalling device, comprising a base, a first lower slider, a second lower slider, a first bidirectional screw rod, a fixing plate, a first upper slider, a second upper slider, a second bidirectional screw rod, an upper nut, a lower nut, a lifting and telescopic cylinder, a support plate and two parallel screw rods;

[0007] A screw rod is vertically fixed at each of the two ends of the base, and a fixing plate movably inserted on the two screw rods is provided above the base, and the upper nut and the lower nut are respectively screwed on the screw rods below the fixing plate;

[0008] The base is fixed with the lifting and telescopic cylinder with the telescopic end facing upward, and the telescopic end of the lifting and telescopic cylinder is fixed with the support plate placed under the fixed plate, and the support plate is rotatably provided with the first bidirectional screw rod arranged along the length direction of the support plate, one end of the first bidirectional screw rod is sleeved with the first lower sliding block and screwed thereon, and the other end of the first bidirectional screw rod is sleeved with the second lower sliding block and screwed thereon; the bottom surface of the fixed plate is rotatably provided with the second bidirectional screw rod arranged along the length direction of the fixed plate, one end of the second bidirectional screw rod is sleeved with the first upper sliding block and screwed thereon, and the other end of the second bidirectional screw rod is sleeved with the second upper sliding block and screwed thereon.

[0009] Preferably, the opposing surfaces between the first upper slider, the first lower slider, the second upper slider and the second lower slider are arc-shaped surfaces, and when the first upper slider, the first lower slider, the second upper slider and the second lower slider are in contact and engaged, a cavity structure with a cylindrical interior is formed.

[0010] Preferably, a lower sliding groove is opened on the top surface of the support plate along the length direction of the support plate, and the first lower sliding block and the second lower sliding block are slidably engaged in the lower sliding groove; an upper sliding groove is opened on the bottom surface of the fixed plate along the length direction of the fixed plate, and the first upper sliding block and the second upper sliding block are slidably engaged in the upper sliding groove.

[0011] Preferably, the lifting and telescopic cylinder is a pneumatic cylinder or an oil cylinder.

[0012] The second object of the present invention is implemented by the following technical solution: a generator stall test method, comprising the following steps:

[0013] (1) Insert the rotating shaft of the generator to be tested into the space enclosed by the first upper slider, the first lower slider, the second upper slider and the second lower slider;

[0014] (2) Screw the upper nut and the lower nut to lower the fixing plate, driving the first upper slider and the second upper slider to lower at the same time until the first upper slider and the second upper slider are in contact with the generator shaft; control the support plate to rise by the lifting and telescopic cylinder, driving the first lower slider and the second lower slider to rise at the same time until the first lower slider and the second lower slider are in contact with the generator shaft to adapt to the height of the generator shaft;

[0015] (3) Screw the first bidirectional screw rod to adjust the distance between the first lower slider and the second lower slider, so that the first lower slider and the second lower slider are close to each other. At the same time, screw the second bidirectional screw rod to adjust the distance between the first upper slider and the second upper slider, so that the first upper slider and the second upper slider are close to each other. Finally, the first upper slider, the first lower slider, the second upper slider and the second lower slider cooperate with each other to clamp the generator shaft, so as to ensure that the generator shaft is fixed;

[0016] (4) Power on the stator of the generator and observe whether the generator is damaged.

[0017] The advantages of the present invention are as follows: (1) The present invention is provided with a base, a fixing plate, an upper nut, a lower nut, a lifting and telescopic cylinder, a supporting plate, a first lower slider, a second lower slider, a first bidirectional screw rod, a first upper slider, a second upper slider, a second bidirectional screw rod and two screw rods arranged opposite to each other; when the rotating shaft of the generator extends into the space surrounded by the first upper slider, the first lower slider, the second upper slider and the second lower slider, the height of the fixing plate can be adjusted in the vertical direction by screwing the upper and lower nuts, and the lifting and telescopic cylinder is used to control the lifting and lowering of the supporting plate so that the first upper slider and the first lower slider are close to each other, and the second upper slider and the second lower slider are close to each other; the distance between the first lower slider and the second lower slider can be adjusted by screwing the first bidirectional screw rod, and the distance between the first upper slider and the second upper slider can be adjusted by screwing the second bidirectional screw rod at the same time, and the rotating shaft of the generator is clamped by the mutual cooperation of the first upper slider, the first lower slider, the second upper slider and the second lower slider to achieve the purpose of blocking rotation.

[0018] (2) The present invention adopts a generator stalling device to replace the overhead crane and the soft belt. The lateral distance between the first upper slider and the second upper slider, and between the first lower slider and the second lower slider of the generator stalling device are adjustable. The vertical distance between the first upper slider and the first lower slider, and between the second upper slider and the second lower slider are also adjustable. Therefore, the present invention can be applied to generators with different shaft diameters.

[0019] (3) The height of the fixing plate can be adjusted in the vertical direction by screwing the upper and lower nuts, and the lifting and lowering of the supporting plate can be controlled by the lifting and telescopic cylinder. The invention can be applied to generator shafts of different heights, and has the advantages of simple operation, wide application, and convenience. Description of the drawings:

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a structural schematic diagram of the present invention and the generator shaft.

[0022] Figure 2 yes Figure 1 AA section view.

[0023] The components in the accompanying drawings are marked as follows: base 1, fixing plate 2, upper slide groove 2.1, upper nut 3, lower nut 4, lifting and telescopic cylinder 5, support plate 6, lower slide groove 6.1, first lower slider 7, second lower slider 8, first bidirectional lead screw 9, first upper slider 10, second upper slider 11, second bidirectional lead screw 12, screw 13, generator shaft 14. Specific implementation method:

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0025] Example 1: Figure 1-Figure 2 As shown, a generator stalling device comprises a base 1, a fixing plate 2, an upper nut 3, a lower nut 4, a lifting and telescopic cylinder 5, a supporting plate 6, a first lower slider 7, a second lower slider 8, a first bidirectional screw rod 9, a first upper slider 10, a second upper slider 11, a second bidirectional screw rod 12 and two parallel screw rods 13;

[0026] A screw rod 13 is vertically fixed at both ends of the base 1, and a fixing plate 2 movably inserted on the two screw rods 13 is provided above the base 1, and the fixing plate 2 is arranged perpendicular to the screw rods 13. Upper nuts 3 and lower nuts 4 are respectively screwed on the screw rods 13 on the upper and lower sides of the fixing plate 2. The fixing plate 2 is movably inserted on the two screw rods 13. The height of the fixing plate 2 can be adjusted in the vertical direction by screwing the upper nuts 3 and the lower nuts 4. At the same time, the upper nuts 3 and the lower nuts 4 play a role in limiting and fixing the fixing plate 2.

[0027] A lifting and telescopic cylinder 5 with its telescopic end facing upward is fixed on the base 1. The lifting and telescopic cylinder 5 is a pneumatic cylinder or an oil cylinder. A support plate 6 is fixed to the telescopic end of the lifting and telescopic cylinder 5, which is parallel to the fixed plate 2 and placed below the fixed plate 2. The lifting and telescopic cylinder 5 controls the lifting and lowering of the support plate 6.

[0028] A first bidirectional screw rod 9 arranged along the length direction of the support plate 6 is rotatably provided on the support plate 6, specifically: bearing seats are fixed at both ends of the support plate 6, and a first bidirectional screw rod 9 is rotatably provided between the two bearing seats, and the ends of the first bidirectional screw rod 9 are respectively installed on the corresponding bearing seats through bearings; a sliding groove 6.1 is opened on the top surface of the support plate 6 along the length direction of the support plate 6, one end of the first bidirectional screw rod 9 is sleeved with a first lower slider 7 screwed, and the other end of the first bidirectional screw rod 9 is sleeved with a second lower slider 8 screwed, and the first lower slider 7 and the second lower slider 8 are both slidably engaged in the sliding groove 6.1. By screwing the first bidirectional screw rod 9, the first lower slider 7 and the second lower slider 8 can be relatively moved along the sliding groove 6.1 to adjust the distance between the first lower slider 7 and the second lower slider 8;

[0029] A second bidirectional screw rod 12 arranged along the length direction of the fixed plate 2 is rotatably provided on the bottom surface of the fixed plate 2. Specifically, bearing seats are fixed at both ends of the fixed plate 2, and a second bidirectional screw rod 12 is rotatably provided between the two bearing seats, and the ends of the second bidirectional screw rod 12 are respectively installed on the corresponding bearing seats through bearings; an upper slide groove 2.1 corresponding to the lower slide groove 6.1 is opened on the bottom surface of the fixed plate 2, and a first upper slider 10 is screwed on one end of the second bidirectional screw rod 12, and a second upper slider 11 is screwed on the other end of the second bidirectional screw rod 12, and the first upper slider 10 and the second upper slider 11 are both slidably engaged in the upper slide groove 2.1. By screwing the second bidirectional screw rod 12, the first upper slider 10 and the second upper slider 11 can be relatively moved along the upper slide groove 2.1 to adjust the distance between the first upper slider 10 and the second upper slider 11;

[0030] The opposing surfaces between the first upper slider 10, the first lower slider 7, the second upper slider 11 and the second lower slider 8 are arc-shaped surfaces. When the first upper slider 10, the first lower slider 7, the second upper slider 11 and the second lower slider 8 are in contact and engaged, a cylindrical cavity structure is formed inside. The interior of the cavity structure is used to place the generator shaft 14. The distance between the first upper slider 10 and the second upper slider 11 can be adjusted by screwing the second bidirectional screw rod 12. The lifting and lowering of the support plate 6 is controlled by the lifting and telescopic cylinder 5, so as to adjust the distance between the first upper slider 10 and the first lower slider 7, the second upper slider 11 and the second lower slider 8. The first upper slider 10, the first lower slider 7, the second upper slider 11 and the second lower slider 8 can be tightly embraced by the mutual cooperation of the first upper slider 10, the first lower slider 7, the second upper slider 11 and the second lower slider 8 to achieve the purpose of stalling. In addition, the generator can be applied to generators with different shaft diameters.

[0031] The present invention adopts a generator blocking device to replace the overhead crane and the soft belt. When the rotating shaft of the generator extends into the space surrounded by the first upper slider 10, the first lower slider 7, the second upper slider 11 and the second lower slider 8, the height of the fixing plate 2 can be adjusted in the vertical direction by screwing the upper nut 3 and the lower nut 4, and the lifting and lowering of the support plate 6 can be controlled by the lifting and telescopic cylinder 5, so that the first upper slider 10 and the first lower slider 7 are close to each other, and the second upper slider 11 and the second lower slider 8 are close to each other; the distance between the first lower slider 7 and the second lower slider 8 can be adjusted by screwing the first bidirectional screw rod 9, and the distance between the first upper slider 10 and the second upper slider 11 can be adjusted by screwing the second bidirectional screw rod 12. 7. The second upper slider 11 and the second lower slider 8 cooperate with each other to clamp the generator shaft to achieve the purpose of blocking; and because the lateral distance between the first upper slider 10 and the second upper slider 11, and between the first lower slider 7 and the second lower slider 8 are adjustable, the vertical distance between the first upper slider 10 and the first lower slider 7, and between the second upper slider 11 and the second lower slider 8 are also adjustable, therefore, the present invention can be applied to generators with different shaft diameters; in addition, the present invention can adjust the height of the fixing plate 2 in the vertical direction by screwing the upper nut 3 and the lower nut 4, and control the lifting and lowering of the support plate 6 by the lifting and telescopic cylinder 5, so it can be applied to generator shafts 14 of different heights, and has the advantages of simple operation, wide application and convenience.

[0032] Embodiment 2: A method for testing a stalled rotor of a generator using the stalled rotor device of Embodiment 1, comprising the following steps:

[0033] (1) Insert the rotating shaft of the generator to be tested into the space enclosed by the first upper slider 10, the first lower slider 7, the second upper slider 11 and the second lower slider 8;

[0034] (2) Screw the upper nut 3 and the lower nut 4 to lower the fixing plate 2, driving the first upper slider 10 and the second upper slider 11 to lower simultaneously, until the first upper slider 10 and the second upper slider 11 are in contact with the generator shaft 14; control the support plate 6 to rise by the lifting and telescopic cylinder 5, driving the first lower slider 7 and the second lower slider 8 to rise simultaneously, until the first lower slider 7 and the second lower slider 8 are in contact with the generator shaft 14, so as to adapt to the height of the generator shaft 14;

[0035] (3) Screw the first bidirectional screw 9 to adjust the distance between the first lower slider 7 and the second lower slider 8, so that the first lower slider 7 and the second lower slider 8 are close to each other. At the same time, screw the second bidirectional screw 12 to adjust the distance between the first upper slider 10 and the second upper slider 11, so that the first upper slider 10 and the second upper slider 11 are close to each other. Finally, the first upper slider 10, the first lower slider 7, the second upper slider 11 and the second lower slider 8 cooperate with each other to clamp the generator shaft 14, so as to ensure that the generator shaft 14 is fixed;

[0036] (4) Power on the generator stator and observe whether the motor is damaged.

[0037] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A generator stall device, characterized in that: It includes a base, a first lower slider, a second lower slider, a first bidirectional screw rod, a fixing plate, a first upper slider, a second upper slider, a second bidirectional screw rod, an upper nut, a lower nut, a lifting and telescopic cylinder, a support plate and two parallel screw rods; A screw rod is vertically fixed at each of the two ends of the base, and a fixing plate movably inserted on the two screw rods is provided above the base, and the upper nut and the lower nut are respectively screwed on the screw rods below the fixing plate; The base is fixed with the lifting and telescopic cylinder with the telescopic end facing upward, and the telescopic end of the lifting and telescopic cylinder is fixed with the support plate placed under the fixed plate, and the support plate is rotatably provided with the first bidirectional screw rod arranged along the length direction of the support plate, one end of the first bidirectional screw rod is sleeved with the first lower sliding block and screwed thereon, and the other end of the first bidirectional screw rod is sleeved with the second lower sliding block and screwed thereon; the bottom surface of the fixed plate is rotatably provided with the second bidirectional screw rod arranged along the length direction of the fixed plate, one end of the second bidirectional screw rod is sleeved with the first upper sliding block and screwed thereon, and the other end of the second bidirectional screw rod is sleeved with the second upper sliding block and screwed thereon.

2. A generator stall device according to claim 1, characterized in that: The opposing surfaces between the first upper slider, the first lower slider, the second upper slider and the second lower slider are arc-shaped surfaces. When the first upper slider, the first lower slider, the second upper slider and the second lower slider are in contact and buckled, a cylindrical cavity structure is formed inside.

3. A generator stall device according to claim 1 or 2, characterized in that: A sliding groove is provided on the top surface of the support plate along the length direction of the support plate, and the first lower slider and the second lower slider are slidably engaged in the sliding groove; an upper sliding groove is provided on the bottom surface of the fixed plate along the length direction of the fixed plate, and the first upper slider and the second upper slider are slidably engaged in the upper sliding groove.

4. A generator stall device according to claim 3, characterized in that: The lifting and telescopic cylinder is a gas cylinder or an oil cylinder.

5. A method for testing a generator stalled rotor device using any one of claims 1 to 4, characterized in that: It includes the following steps: (1) Insert the rotating shaft of the generator to be tested into the space enclosed by the first upper slider, the first lower slider, the second upper slider and the second lower slider; (2) Screw the upper nut and the lower nut to lower the fixing plate, driving the first upper slider and the second upper slider to lower at the same time until the first upper slider and the second upper slider are in contact with the generator shaft; control the support plate to rise by the lifting and telescopic cylinder, driving the first lower slider and the second lower slider to rise at the same time until the first lower slider and the second lower slider are in contact with the generator shaft to adapt to the height of the generator shaft; (3) Screw the first bidirectional screw rod to adjust the distance between the first lower slider and the second lower slider, so that the first lower slider and the second lower slider are close to each other. At the same time, screw the second bidirectional screw rod to adjust the distance between the first upper slider and the second upper slider, so that the first upper slider and the second upper slider are close to each other. Finally, the first upper slider, the first lower slider, the second upper slider and the second lower slider cooperate with each other to clamp the generator shaft, so as to ensure that the generator shaft is fixed; (4) Power on the stator of the generator and observe whether the generator is damaged.

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