CN212627371U - Rotor structure of hydraulic generator - Google Patents

Abstract

The utility model belongs to the technical field of hydraulic generator, specifically be hydraulic generator's rotor structure, including main shaft and rotor support, the last wheel hub that is used for the suit at the main epaxial that sets firmly of rotor support, adopt interference magnitude not more than 0.1 mm's interference fit to be connected between wheel hub and the main shaft, still connect through the key-type connection of combination between wheel hub and the main shaft. The scheme solves the problem that a main shaft and a rotor support of a rotor structure of a hydraulic generator in the prior art are difficult to assemble on site.

Description

Rotor structure of hydraulic generator

Technical Field

The utility model belongs to the technical field of hydraulic generator, specifically be hydraulic generator's rotor structure.

Background

The rotor of the hydraulic generator is used for transmitting the torque generated by the unit to the magnetic yoke, so that the magnetic yoke rotates to generate power. The rotor comprises a main shaft and a rotor support used for supporting a magnetic yoke, the main shaft and a hub of the rotor support are sleeved in a shrink mode, and a torque value required by the magnetic yoke is transmitted through friction force under shrinkage positive pressure formed by the hub of the rotor support of the shrink sleeve and the main shaft after the hub of the rotor support of the shrink sleeve is cooled.

With the increase of the output power of the hydraulic generator, the generator rotor needs to meet the requirement that the transmitted unit torque is very large (exceeding 5000KN. m), particularly, the large-output hydraulic generator with a single-shaft suspension structure has a large base volume, and due to the limitation of transportation conditions (the limitation size of transportation parts is 3m high and 4m wide and the weight is within 50T), the structure of the rotor needs to adopt a structure that a main shaft and a rotor bracket are assembled on the site of a power station. Because the output power of the unit is very high, the friction force formed by the interference fit of the conventional hot sleeve is adopted to transmit the torque, and the torque of the magnetic yoke to be transmitted is very large, the interference magnitude between the main shaft and the hub of the rotor support is very large, so that the requirements on heating equipment and electric power are very high when the hot sleeve connection operation is carried out on site, the gap required by the hot sleeve is difficult to achieve, and the connection operation of the main shaft and the rotor support is very difficult. Meanwhile, due to the fact that interference magnitude is very large, structural stress generated after a hub of the rotor support is heated and cooled can be very large, and therefore higher mechanical performance requirements are provided for materials of the hub portion of the rotor support, material cost of the rotor support is increased, and difficulty of structural design is also increased.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a hydraulic generator's rotor structure to solve among the prior art hydraulic generator's rotor structure's main shaft and the more difficult problem of spider when the on-the-spot assembly.

In order to achieve the above object, the utility model discloses a basic scheme provides a hydraulic generator's rotor structure, including main shaft and rotor support, the last wheel hub that is used for the suit at the main epaxial that sets firmly of rotor support, adopt interference magnitude not more than 0.1 mm's interference fit to connect between wheel hub and the main shaft, still connect through the key-type connection between wheel hub and the main shaft.

The principle and the beneficial effect of the basic scheme are as follows: by adopting the interference fit connection mode with the interference magnitude not greater than 0.1 mm, the hub can be assembled without using a shrink fit mode in the process of sleeving the hub on the spindle, so that the use of shrink fit equipment is reduced, and meanwhile, the concentric precision between the spindle and the hub is ensured due to the interference fit relationship; through the mode of combination key connection, make the combination key transmit the moment of torsion between main shaft and the rotor support, and the mode of key connection only need the cold state assembly can, reduced the requirement to equipment during the assembly to make things convenient for the connection operation between main shaft and the rotor support, and then reduced the assembly degree of difficulty of main shaft and rotor support at the scene.

Further, the combination key comprises a first key body and a second key body, the first key body is attached to a key groove in the main shaft, an accommodating cavity is formed between the first key body and the key groove in the hub, and the second key body is located in the accommodating cavity and attached to the first key body and the hub. The setting that holds the chamber makes and reduces area of contact between the keyway of first key body and wheel hub to reduce frictional force's production, make wheel hub in the in-process of main shaft on the suit, first key body can not produce frictional resistance to wheel hub's motion, has made things convenient for the rotor support suit to the main shaft on. After the rotor support is sleeved, the second key body is assembled into the containing cavity, and the second key body is abutted against the first key body and the hub, so that the first key body and the second key body jointly bear shear stress and extrusion stress generated between the main shaft and the rotor support due to torque, and the torque between the main shaft and the rotor support can be safely transmitted.

Further, the cross section of the first key body is T-shaped. By adopting the structure, the two accommodating cavities are symmetrically distributed on the two sides of the first key body, so that the stress on the two sides of the first key body is balanced when the second key body is assembled into the accommodating cavities, and the influence on the first key body during the assembly of the second key body is reduced.

Further, the number of the combination keys is at least two, and all the combination keys are uniformly distributed along the circumferential direction of the main shaft. By adopting the arrangement mode, force transmission points between the main shaft and the rotor support are uniformly distributed, so that the stress born by the main shaft and the rotor support is uniformly distributed, and the phenomenon of over-concentration of the stress is avoided.

Furthermore, a guide key is arranged between the main shaft and the hub. The arrangement of the guide key enables the guide key to position the key groove position used for assembling the combined key between the main shaft and the hub when the hub is sleeved on the main shaft, so that the accuracy of the relative position between the rotor support and the main shaft is guaranteed.

Furthermore, a clamping ring contacting with the end part of the hub is clamped on the main shaft. By adopting the arrangement mode, the clamping ring limits the end part of the hub, so that the rotor support is prevented from moving along the axial direction of the main shaft.

Further, the snap ring split type sets up, and the retaining ring that is connected with the integral type can be dismantled in the outside of snap ring, the retaining ring can be dismantled with wheel hub's tip and be connected. By adopting the arrangement mode, the clamping ring is convenient to mount, connect and dismount.

Drawings

Fig. 1 is an assembly schematic view of a main shaft and a hub of a rotor bracket in an embodiment of a rotor structure of a hydraulic generator according to the present invention;

FIG. 2 is a top view of FIG. 1;

FIG. 3 is a schematic structural view of the retainer ring and the retainer ring of FIG. 2 with the retainer ring and the retainer ring removed;

FIG. 4 is an enlarged view taken at A in FIG. 3;

FIG. 5 is a schematic view of the structure of FIG. 4 without the second key body;

FIG. 6 is a left side view of the combination key of FIG. 4;

fig. 7 is a partial schematic view of fig. 1 at the guide key position.

Detailed Description

The following is further detailed by way of specific embodiments:

reference numerals in the drawings of the specification include: the main shaft 1, the hub 2, the combination key 3, the first key body 31, the second key body 32, the accommodating cavity 33, the guide key 4, the clamping ring 5 and the retaining ring 6.

Example (b): in the present embodiment, a main shaft 1, a rotor bracket and a connection structure therebetween in the rotor structure are mainly described, and other structural parts of the rotor structure may refer to related descriptions in the prior art, which are not described herein again; as shown in fig. 1 to 7, the rotor structure includes a main shaft 1 and a rotor support, a hub 2 for being sleeved on the main shaft 1 is fixedly disposed on the rotor support, the hub 2 and the main shaft 1 are connected in an interference fit manner, where an interference magnitude is not greater than 0.1 mm, and in this embodiment, the interference magnitude is preferably 0.05-0.09 mm; the hub 2 is connected with the main shaft 1 through a combination key 3, in the embodiment, two combination keys 3 are arranged, and the two combination keys 3 are symmetrically distributed on two sides of the main shaft 1. The combination key 3 comprises a first key body 31 and a second key body 32, the cross section of the first key body 31 is T-shaped and is attached to a key groove on the main shaft 1, two accommodating cavities 33 are arranged between the first key body 31 and the key groove on the hub 2, the two accommodating cavities 33 are distributed on two sides of the first key body 31, and the second key body 32 is positioned in the accommodating cavities 33 and is attached to the first key body 31 and the hub 2 at the same time, so that the first key body 31 and the second key body 32 are combined to form a key structure with a rectangular cross section. To facilitate the installation and positioning of first key body 31, first key body 31 is connected to main shaft 1 by a screw. A guide key 4 is further arranged between the main shaft 1 and the hub 2 of the rotor support, the guide key 4 is preferably a flat key with a rectangular cross section, the length direction of the guide key 4 is parallel to the axial direction of the main shaft 1 and is fixedly connected through a screw, and the guide key 4 and the combined key 3 form an azimuth angle of 90 degrees. The joint has snap ring 5 with the 2 tip contacts of wheel hub of spider on main shaft 1, specifically for having seted up the draw-in groove along circumference on main shaft 1, and snap ring 5 blocks establishes in the draw-in groove, and snap ring 5 is two semicircle loop configuration that the split type set up to make things convenient for snap ring 5 card to go into in the draw-in groove. The outer side of the clamping ring 5 is provided with an integrated circular retaining ring 6, and the retaining ring 6 is tangent to the outer side of the clamping ring 5 and is connected with the end part of the hub 2 through a screw.

The specific implementation process is as follows: before the main shaft 1 and the rotor support are assembled, the guide key 4 is connected to the main shaft 1 through a screw, and the first key body 31 is connected to the main shaft 1 through a screw. Then, the hub 2 of the rotor bracket is sleeved on the main shaft 1, and because the interference between the main shaft 1 and the hub 2 is relatively small, the hub 2 can be pushed to be gradually sleeved on the main shaft 1 by adopting a static pressure mode and the like, and the accuracy of the positions of the key grooves for mounting the combination key 3 on the hub 2 and the main shaft 1 is ensured under the action of the guide key 4. When the hub 2 of the rotor support is sleeved in place, two accommodating cavities 33 are formed between two sides of the first key body 31 and the key grooves on the hub 2, then the second key body 32 is driven into the accommodating cavities 33, the second key body 32 is respectively abutted against the first key body 31 and the hub 2, the first key body 31 and the second key body 32 are combined to form a key structure with a rectangular cross section, and in order to enhance the stability of the second key body 32, the second key body 32 can be welded and fixed with the first key body 31 after being assembled in place. And finally, clamping the clamping ring 5 and the check ring 6 onto the main shaft 1 and fixing the clamping ring and the check ring through screws, so that the assembly of the rotor bracket and the main shaft 1 is completed. The whole assembly process does not need to use hot jacket equipment for heating, so that the dependence on the hot jacket equipment is reduced, and the difficulty of the whole assembly operation is reduced compared with the prior art; meanwhile, the torque between the main shaft 1 and the rotor support is transmitted through the combined key 3, the uncontrollable deformation factor generated by the thermal stress generated by the rotor support after heating is reduced, the stress state between the rotor support and the main shaft 1 is clear, and compared with interference fit connection using interference, the rotor support is manufactured without using a material with higher mechanical property, so that the material cost is saved.

The above description is only an example of the present invention, and the common general knowledge of the known specific structures and characteristics of the embodiments is not described herein. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.

Claims (7)

1. Hydraulic generator's rotor structure, including main shaft and rotor support, the last wheel hub that is used for the suit on the main shaft that sets firmly of rotor support, its characterized in that: the hub and the main shaft are connected in an interference fit mode, the interference magnitude of not more than 0.1 mm, and the hub and the main shaft are connected through a combined key.

2. The rotor structure of a hydro-generator according to claim 1, wherein: the combined key comprises a first key body and a second key body, the first key body is attached to a key groove in the main shaft, an accommodating cavity is formed between the first key body and the key groove in the hub, and the second key body is located in the accommodating cavity and attached to the first key body and the hub.

3. The rotor structure of a hydro-generator according to claim 2, wherein: the cross section of the first key body is T-shaped.

4. The rotor structure of a hydro-generator according to any one of claims 1 to 3, wherein: the combined keys are at least two, and all the combined keys are uniformly distributed along the circumferential direction of the main shaft.

5. The rotor structure of a hydro-generator according to any one of claims 1 to 3, wherein: and a guide key is also arranged between the main shaft and the hub.

6. The rotor structure of a hydro-generator according to claim 5, wherein: the main shaft is clamped with a snap ring which is contacted with the end part of the hub.

7. The rotor structure of a hydro-generator according to claim 6, wherein: the snap ring split type sets up, and the retaining ring that is connected with the integral type can be dismantled in the outside of snap ring, the retaining ring can be dismantled with wheel hub's tip and be connected.

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