CN214281069U

CN214281069U - Device for eliminating gap between pole-to-pole support blocks of hydraulic generator

Info

Publication number: CN214281069U
Application number: CN202022551543.6U
Authority: CN
Inventors: 王选凡; 张岗; 高寒; 朱存利; 闫红军
Original assignee: Huaneng Lancang River Hydropower Co Ltd
Current assignee: Huaneng Lancang River Hydropower Co Ltd
Priority date: 2020-11-06
Filing date: 2020-11-06
Publication date: 2021-09-24
Anticipated expiration: 2030-11-06

Abstract

The utility model relates to an eliminate device in hydraulic generator magnetic pole interelectrode supporting block clearance belongs to hydraulic generator technical field. The device comprises a cuboid cushion block; the cuboid cushion block is provided with an n-shaped groove in the horizontal direction; the notch of the n-shaped groove is positioned on the high-X-width surface of the cuboid cushion block; the width of the n-shaped groove is consistent with the diameter of the original adjusting block fixing bolt hole; the length and the thickness of the cuboid cushion block are consistent with the length and the thickness of the original adjusting block. The utility model has novel structure and convenient use; through install this additional between interelectrode supporting shoe and adjustment piece the utility model discloses the device effectively eliminates interelectrode supporting shoe and fixing base clearance, ensures simultaneously that the cushion installed safely firm, realizes developing the interior magnetic pole air gap adjustment back generator safety and stability operation of machine hole.

Description

Device for eliminating gap between pole-to-pole support blocks of hydraulic generator

Technical Field

The utility model belongs to the technical field of hydraulic generator, concretely relates to eliminate device in hydraulic generator magnetic pole interelectrode supporting block clearance.

Background

The rotor and the accessory equipment of the hydraulic generator belong to high-speed rotating equipment, any part of the rotating part of the hydraulic generator is loosened and flies out, serious generator burning accidents can occur, in order to prevent the magnetic pole coil from generating harmful deformation along the tangential direction under the action of centrifugal force in the starting process of the generator and prevent the insulation of the coil from being damaged due to the looseness of the magnetic pole coil, a supporting block is arranged between the magnetic poles of the rotor of the large salient pole synchronous generator. As shown in fig. 1 and 2, the inter-pole support block 2 is fixed to the support base 4 by two inter-pole support block locking screws 1, the support base 4 is fixed to the yoke 8 by a first screw 5, and the adjusting block 3 is configured on site according to the installation size so that the inter-pole support block 2 is tightly attached to the magnetic poles on both sides; the magnetic pole dovetail 9 of the magnetic pole 10 is clamped into the magnetic yoke 8 dovetail groove, and the magnetic pole key 7 is driven into (in interference fit with) the space between the magnetic pole dovetail 9 and the magnetic yoke dovetail groove.

In recent years, with the production of power generation of a giant unit, the problem of large low-frequency vibration of a stator of a generator caused by uneven dynamic air gap of a rotor magnetic pole occurs, wherein the glutinous rice crossing adopts methods of adjusting the air gap of the magnetic pole in a pit (the rotor is not lifted out of the pit) and the like, and a good effect is achieved. The adjustment of the magnetic pole air gap is realized by adjusting the thickness of the spacer 6 between the magnetic pole and the magnetic yoke.

For the magnetic pole adopting the dove tail type fixation, as shown in fig. 2, because the contact surface of the dove tail and the magnetic yoke has an included angle alpha with the radial direction, after the thickness of the magnetic pole gasket is adjusted, the corresponding magnetic pole can generate circumferential displacement, and the distance between the magnetic pole and the adjacent magnetic pole in the displacement direction is reduced. Because the outer edge of the inter-pole supporting block forms an included angle beta with the radial direction, the inter-pole supporting block needs to move outwards along the radial direction to reserve a magnetic pole displacement space, and a gap is inevitably generated between the inter-pole supporting block and a magnetic pole or a fixed seat and an adjusting block. The inter-pole support block needs to move outwards by a distance L = kh, h is a change value of the thickness of the magnetic pole pad, k is an adjustment coefficient of the inter-pole support block, k =0.5tan (pi-alpha) tan (pi-beta), and if α =60 ° and β =4 °, k =0.5tan30 ° tan86 ° =4.128, that is, the inter-pole support block needs to move outwards by 4.128mm every time the thickness of the magnetic pole pad increases by 1 mm. According to the magnetic pole air gap adjusting experience, the adjusting amount of the thickness of the magnetic pole shim is within 2 mm.

After the magnetic pole adjustment is carried out in the machine pit, the length (usually 250mm-350 mm) of the inter-pole supporting block is much larger than the distance (within 50 mm) between the rotor and the stator of the generator, so that the condition of disassembling the inter-pole supporting block and the adjusting block is not provided, and the generated gap cannot be eliminated by a method of machining the inter-pole supporting block or the adjusting block. If no measures are taken, the inter-pole supporting blocks cannot be reliably locked on the magnetic yokes, the risk of fatigue fracture of the supporting block tensioning screw exists in the running process of the unit, and the accident that the inter-pole supporting blocks and accessories are thrown out to cause the generator to sweep the room can occur. Therefore, how to overcome the defects of the prior art is a problem to be solved urgently in the technical field of the current hydraulic generator.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving prior art's not enough, provide a eliminate device in hydraulic generator magnetic pole interelectrode supporting shoe clearance, the device solves and develops when the magnetic pole air gap adjustment in the pit on the generator that the magnetic pole adopted the fixed form of dove tail, and the fixed unreliable problem of interelectrode supporting shoe improves unit operation fail safe nature.

In order to achieve the above object, the utility model adopts the following technical scheme:

a device for eliminating the gap between the supporting blocks between the poles of a hydraulic generator comprises a cuboid cushion block; the cuboid cushion block is provided with an n-shaped groove in the horizontal direction; the notch of the n-shaped groove is positioned on the high-X-width surface of the cuboid cushion block;

the width of the n-shaped groove is consistent with the diameter of the original adjusting block fixing bolt hole;

the length and the width of the cuboid cushion block are consistent with the length and the width of the original adjusting block;

the depth of the n-shaped groove is 0.6-0.8 times of the length of the cuboid cushion block, namely 0.6-0.8L.

Further, it is preferable that the rectangular parallelepiped block is made of the same material as the inter-electrode support block.

Further, preferably, the cuboid cushion block is made of epoxy glass cloth.

Further, preferably, the thickness of the cuboid-shaped cushion block is 0.5tan (pi-alpha) tan (pi-beta) h, wherein h is the magnetic pole air gap adjustment amount and is determined according to the magnetic pole air gap adjustment requirement; alpha is an included angle between the contact surface of the pigeon tail and the magnet yoke and the radial direction; beta is the included angle between the outer edge of the interpolar support block and the radial direction.

The device for eliminating the gap between the pole and the supporting block of the hydraulic generator adopts the cushion block which is made of the material which is consistent with the material of the pole and the supporting block, has insulating property, is not easy to corrode and has high strength, and is generally made of epoxy glass cloth material; the device of the utility model comprises a cuboid cushion block. The rectangular cushion block should have an anti-drop structure, should not drop even if it is fixed with looseness, and be convenient for placing in a narrow space. The middle part of the cuboid cushion block is provided with a groove, and the whole cuboid cushion block is n-shaped; the overall dimensions L and H of the cuboid cushion block are consistent with the dimensions of the original adjusting block, and the width of the middle groove is consistent with the diameter of the fixing bolt hole of the original adjusting block, as shown in figures 3 and 4. The thickness of the cushion block is determined according to 0.5tan (pi-alpha) tan (pi-beta) h, h is the adjustment amount of the magnetic pole air gap, the adjustment amount is determined according to the adjustment requirement of the magnetic pole air gap, and the thickness size of the cushion block is determined according to the actually measured gap when the gap is measured conditionally.

After finishing processing the rectangular cushion block according to the field thickness requirement, loosening the magnetic pole supporting block locking nut, downwards arranging the rectangular cushion block with a notch between the interelectrode supporting block and the original adjusting block as shown in figure 5, hanging the rectangular cushion block on the interelectrode supporting block locking screw rod through a groove structure, coating epoxy glue on the contact surfaces of the cushion block, the interelectrode supporting block and the adjusting block, and locking the interelectrode supporting block locking nut.

Compared with the prior art, the utility model, its beneficial effect does:

the utility model has novel structure and convenient use; glutinous zha du power plant develops generator stator vibration processing in 2018 and 2020 and adopts the utility model discloses corresponding clearance is eliminated to the device, and the unit operation is more than 2 years, does not take place the condition that interpolar supporting shoe tensioning screw splits or add the cushion and drop. The structure cushion block is additionally arranged between the interpolar supporting block and the adjusting block, so that the gap between the interpolar supporting block and the fixing seat is effectively eliminated, the added cushion block is ensured to be safely and firmly installed, and the safe and stable operation of the generator after the magnetic pole in the generator pit is adjusted is realized.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

FIG. 1 is a schematic view of an installation of a pole-supporting block between poles of a generator rotor;

fig. 2 shows the included angle between the magnetic pole dovetail and the inter-pole support block; wherein (a) is a schematic diagram of an included angle between a contact surface of the pigeon tail and the magnetic yoke and the radial direction; (b) the included angle between the outer edge of the inter-pole supporting block and the radial direction is shown in the schematic diagram;

FIG. 3 is a schematic cross-sectional view of the original adjusting block;

fig. 4 is a schematic cross-sectional view of the device for eliminating the gap between the pole-to-pole support blocks of the hydraulic generator according to the present invention;

fig. 5 is an installation schematic view of the device for eliminating the gap between the pole-to-pole support blocks of the hydraulic generator according to the present invention;

wherein, 1, the interpolar supporting block locks the threaded spindle; 2. an inter-electrode support block; 3. an adjusting block; 4. a supporting seat; 5. a first screw; 6. a gasket; 7. a magnetic pole bond; 8. a magnetic yoke; 9. magnetic pole dovetails; 10. a magnetic pole; 100. a cuboid cushion block; 101. an n-shaped groove.

Detailed Description

The present invention will be described in further detail with reference to examples.

It will be appreciated by those skilled in the art that the following examples are illustrative of the invention only and should not be taken as limiting the scope of the invention. The specific techniques, connections, conditions, or the like, which are not specified in the examples, are performed according to the techniques, connections, conditions, or the like described in the literature in the art or according to the product specification. The materials, instruments or equipment are not indicated by manufacturers, and all the materials, instruments or equipment are conventional products which can be obtained by purchasing.

As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In the description of the present invention, "a plurality" means two or more unless otherwise specified. The terms "inner," "upper," "lower," and the like, refer to an orientation or a state relationship based on that shown in the drawings, which is for convenience of description and simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "provided" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. To those of ordinary skill in the art, the specific meaning of the above terms in the present invention is understood according to the specific situation.

It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

As shown in fig. 4 and 5, an apparatus for removing a gap between pole-to-pole support blocks of a hydro-generator includes a rectangular parallelepiped block 100; the cuboid cushion block 100 is provided with an n-shaped groove 101 in the horizontal direction; the notch of the n-shaped groove 101 is positioned on the high-X-width surface of the cuboid cushion block 100;

the width of the n-shaped groove 101 is consistent with the diameter D of the fixing bolt hole of the original adjusting block 3;

the length L and width H of the rectangular parallelepiped block 100 are the same as the length L and width H of the original adjusting block 3, as shown in fig. 3 and 4.

The depth of the n-shaped groove is 0.6-0.8 times of the length of the cuboid cushion block, namely 0.6-0.8L, and the n-shaped groove can be used for the locking screw rod 1 of the two interpolar support blocks to pass through.

Preferably, the rectangular block 100 is made of the same material as the inter-electrode support block

Preferably, the rectangular block 100 is made of epoxy glass cloth.

Preferably, the thickness of the cuboid-shaped cushion block 100 is 0.5tan (pi-alpha) tan (pi-beta) h, wherein h is the magnetic pole air gap adjustment amount and is determined according to the magnetic pole air gap adjustment requirement; alpha is an included angle between the contact surface of the pigeon tail and the magnet yoke and the radial direction; beta is the included angle between the outer edge of the interpolar support block and the radial direction.

After finishing processing the cuboid cushion block 100 according to the on-site thickness requirement, loosening the magnetic pole support block locking nut, installing the n-shaped groove 101 of the cuboid cushion block 100 with the notch facing downwards between the inter-polar support block 2 and the original adjusting block 3 as shown in fig. 5, hanging the n-shaped groove 101 on the inter-polar support block locking screw 1 through a groove structure, coating epoxy glue on the contact surfaces of the cuboid cushion block 100, the inter-polar support block 2 and the original adjusting block 3, and locking the inter-polar support block locking nut.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A device for eliminating the gap between the supporting blocks between the poles of a hydraulic generator is characterized by comprising a cuboid cushion block (100); the cuboid cushion block (100) is provided with an n-shaped groove (101) in the horizontal direction; the notch of the n-shaped groove (101) is positioned on the high-X-width surface of the cuboid cushion block (100);

the width of the n-shaped groove (101) is consistent with the diameter of a fixing bolt hole of the original adjusting block (3);

the length and the width of the cuboid cushion block (100) are consistent with the length and the width of the original adjusting block (3);

the depth of the n-shaped groove (101) is 0.6-0.8 times of the length of the cuboid cushion block (100).

2. The apparatus for removing a gap between pole-to-pole support blocks of a hydro-generator according to claim 1, wherein the rectangular parallelepiped block (100) is made of the same material as the pole-to-pole support block.

3. The apparatus for removing a gap between pole-to-pole support blocks of a hydro-generator according to claim 1, wherein the rectangular parallelepiped block (100) is made of epoxy glass cloth.

4. The apparatus for removing a gap between pole-to-pole support blocks of a hydro-generator according to claim 1, wherein the cuboid-shaped spacer block (100) has a thickness of 0.5tan (pi- α) tan (pi- β) h, wherein h is a pole air gap adjustment amount determined according to a pole air gap adjustment requirement; alpha is an included angle between the contact surface of the pigeon tail and the magnet yoke and the radial direction; beta is the included angle between the outer edge of the interpolar support block and the radial direction.