CN111404331A

CN111404331A - Hydro-generator collecting ring

Info

Publication number: CN111404331A
Application number: CN202010293327.8A
Authority: CN
Inventors: 杨斌; 邓亚新; 陈和冲; 顾承庆; 马俊; 张帆; 吴歆; 侯继超; 于淼; 余国良
Original assignee: State Grid Xinyuan Water And Electricity Co ltd; Xin'anjiang Hydroelectric Generation Factory Of State Grid Xinyuan Hydropower Co ltd; State Grid Corp of China SGCC
Current assignee: State Grid Xinyuan Water And Electricity Co ltd; Xin'anjiang Hydroelectric Generation Factory Of State Grid Xinyuan Hydropower Co ltd; State Grid Corp of China SGCC
Priority date: 2020-04-15
Filing date: 2020-04-15
Publication date: 2020-07-10

Abstract

The invention discloses a collecting ring of a hydraulic generator, which comprises a collecting ring central body and is characterized in that the collecting ring central body comprises an inner ring plate fixed on a large shaft of the generator, an upper fixing ring and a lower fixing ring which are insulated from each other are arranged on the outer diameter of the inner ring plate through an insulating ring, the upper fixing ring and the lower fixing ring are respectively and rigidly connected with the upper inner ring and the lower inner ring, and an outer ring is arranged on the upper fixing ring and the lower fixing ring in a matched manner. The insulating layer moves inwards without performing other external insulating treatment, so that the complex insulating installation procedures of additionally installing an insulating pad and the like in the installation process of the collecting ring are reduced, and the overhauling working strength of the collecting ring is reduced; the rigid positioning design of the upper inner ring, the lower inner ring and the central body of the collecting ring improves the mounting and positioning precision, ensures the roughness of the contact surface of the inner ring and the carbon brush during maintenance, reduces the form and position error and improves the contact performance between the inner ring and the carbon brush; the split outer ring also avoids the risk of reducing the insulation of the generator excitation system due to the attachment of carbon powder of the collecting ring.

Description

Hydro-generator collecting ring

Technical Field

The invention relates to a generator technology, in particular to a collecting ring of a hydraulic generator.

Background

The collector ring is one of the important parts of the hydroelectric generating set. When the unit operates, the collecting ring rotates along with the rotor, the fixed carbon brush is contacted with the collecting ring, excitation current is transmitted to the rotor, the generator generates a rotating magnetic field, and electric energy is transmitted to a power grid. Because of the reasons of design and manufacture and the like, the generator collecting ring is arranged between the thrust bearing and the upper guide bearing, and the generator collecting ring is widely applied because of the reasons of relatively simple structure, relatively convenient design and installation and the like. However, the installation position is compact, the overhaul of a guide bearing on the generator and the like is directly influenced, and the corresponding work can be carried out by disassembling the collecting ring in a split manner when the unit is overhauled every time. And because the old collecting ring is fixed by adopting an insulating screw rod, an insulating sleeve and the like, a positioning pin cannot be arranged, so that the positioning precision is poor, and the requirement on the coaxiality of the collecting ring and the rotating center of the large shaft is difficult to ensure by re-installation after split dismantling. Therefore, a common means is to mount a turning tool rest by designing a bracket in a collecting ring chamber, and turn the collecting ring on site to ensure the coaxiality of the mounted collecting ring. However, the turning work is time-consuming and labor-consuming, the operation space of turning personnel is narrow, and serious personal casualty potential safety hazards exist; moreover, the precision of the surface roughness of the turned collecting ring is difficult to ensure due to the limitation of the precision of the temporary tool rest, so that the abrasion loss of the carbon brush is large, and the carbon powder is excessively accumulated, so that the insulation performance of a unit is influenced; in addition, the turning scheme also needs the water turbine generator set to maintain low-speed operation for a long time, so that the operation safety is influenced, and the accident that the guide bearing bush on the generator set burns in the turning process is caused.

Disclosure of Invention

The invention aims to solve the problems and provides a collecting ring of a hydraulic generator, which has the characteristics of meeting the requirement of insulation specification, simplifying the installation process of the collecting ring, having high and quick positioning precision and the like.

The technical problem of the invention is mainly solved by the following technical scheme: the utility model provides a hydraulic generator collecting ring, includes collecting ring central body, characterized by the collecting ring central body is including fixing the epaxial interior crown plate in generator macroaxis, installs insulating ring upper fixed ring and lower fixed ring each other on the interior crown plate external diameter through the insulating ring, on upper fixed ring and the lower fixed ring respectively rigid connection upper inner ring, lower inner ring, with last inner ring, lower inner ring cooperation be equipped with the outer loop.

In the aforementioned hydro-generator collector ring, preferably, the outer ring is a split structure, and includes an upper outer ring and a lower outer ring that are arranged in a central symmetry manner with respect to a large axis of the generator and are staggered up and down.

In the current collecting ring of the hydraulic generator, preferably, the plate bodies with the same diameter of the upper fixing ring and the lower fixing ring are respectively provided with a positioning hole, and the upper inner ring and the lower inner ring are respectively provided with a reference hole matched with the positioning hole.

In the current collecting ring of the hydraulic generator, preferably, a shaft shoulder is arranged on the outer diameter of the inner ring plate, and the insulating ring is positioned through the shaft shoulder; and a shaft shoulder is also arranged on the outer diameter of one end of the insulating ring, and the axial degree of freedom of the lower fixing ring is limited by the shaft shoulder.

In the current collecting ring of the hydraulic generator, preferably, the single-side longitudinal sections of the rings of the upper fixing ring and the lower fixing ring are both L-shaped structures, and are respectively connected with the inner ring plate through a group of radial bolts, and the radial bolts are matched with insulating sleeves and insulating washers.

In the aforementioned current collecting ring of the hydraulic generator, preferably, the upper inner ring and the lower inner ring are both split structures, that is, the two half rings include a first half ring and a second half ring.

In the current collecting ring of the hydraulic generator, preferably, a plurality of tooth-shaped connecting piers are arranged in the inner rings of the upper inner ring and the lower inner ring and are uniformly distributed, and the tooth-shaped connecting piers are matched with the upper fixing ring and the lower fixing ring.

Preferably, the tooth-shaped connecting piers in the upper inner ring and the lower inner ring are arranged in a staggered manner when being matched with the upper fixing ring and the lower fixing ring.

Preferably, the fixing parts for positioning the through-shaft lead are symmetrically distributed in the upper inner ring and the lower inner ring with central points.

In the above hydro-generator collector ring, preferably, the upper fixing ring and the lower fixing ring are split and split structures, wherein the upper fixing ring is composed of a left half ring and a right half ring, and a joint of the upper fixing ring and the inner ring plate is a concave arc screw seat.

The working principle of the technical scheme is as follows: a current transmission device for transmitting the external exciting current to the rotating magnetic pole of the generator. In the running process of the unit, the large shaft of the water turbine drives the collecting ring central body, the upper and lower inner rings of the collecting ring to rotate clockwise along with the large shaft. The external exciting current is transmitted to the upper inner ring and the lower inner ring of the collector ring through the carbon brushes arranged on the upper outer ring and the lower outer ring, and is transmitted to the rotating magnetic pole of the generator through the exciting through-shaft lead wires arranged on the upper inner ring and the lower inner ring, so that the exciting process of the generator is completed.

According to the scheme, the insulating layer is arranged in the central body of the collecting ring, so that the insulation is moved inwards and solidified, and the stability of the integral insulation of the collecting ring is facilitated; the connection fixing structure is optimized, the positioning pin with high-precision matching is preset in advance, and the positioning precision of the collecting ring is improved on the premise that the insulation technical requirement is met. The scheme solves the problem that the original collecting ring needs to be turned on a unit after being disassembled and assembled; the precision of the working surface of the collecting ring can be completely guaranteed by processing through a common machine tool, so that the abrasion of the carbon brush is effectively controlled, and the accumulation of carbon powder is reduced.

The scheme comprises an upper inner ring, a lower inner ring (the sum of the upper inner ring and the lower inner ring is the same as the lower inner ring), an outer ring and an outer ring base, wherein the upper inner ring and the lower inner ring are outwards arranged by taking a collecting ring central body as a center, and are fixed on a large shaft of the hydraulic generator through the collecting ring central body and rotate along with the large shaft of the hydraulic generator. The carbon brush holder assembly is arranged on the outer ring, the carbon brushes on the carbon brush holder set are utilized to transmit exciting current required by the generator set to the upper inner ring and the lower inner ring, and the exciting current is transmitted to the magnetic pole of the generator through the exciting shaft-penetrating lead to complete the exciting circulation of the generator set; the upper inner ring and the lower inner ring are mutually insulated from the collector ring central body so as to meet the requirements of the collector ring on exciting current transmission and ground insulation.

The scheme is specially used for researching the central body of the collecting ring, an inner ring plate is preferably designed to be matched with a large shaft of a generator, then an upper fixing ring and a lower fixing ring are outwards arranged, in addition, the inner ring plate, the upper fixing ring, the lower fixing ring, the upper fixing ring and the lower fixing ring are all separated through insulating rings, insulating layers are all hidden inside the central body of the collecting ring, and the upper inner ring and the lower inner ring are respectively and rigidly connected with the upper fixing ring and the lower fixing ring.

Need not to demolish the central body in order to lead when the bearing dismouting on the generator, this scheme is when designing the collecting ring central body, upper fixing ring, the unilateral longitudinal section of lower fixing ring's annular is established to L shape structure, under the structural strength prerequisite of guaranteeing, be connected with interior crown plate through a set of radial bolt, and add and establish the insulating layer, make this scheme reduce collecting ring central body size, make into whole mutual insulation system with it, the maintenance cycle of collecting ring has been prolonged, if overhaul and exempt from when insulating satisfying the requirement and examine, reduce unit maintenance work load, the efficiency of operation is improved.

Furthermore, the collecting ring outer ring is designed into a split structure, namely an upper outer ring and a lower outer ring, and is symmetrical and vertically staggered with the large axis center of the generator, so that the risk of reducing the insulation of the generator excitation system due to the carbon powder adhesion of the collecting ring is reduced, the structural mode that the original collecting ring upper outer ring and the original collecting ring lower outer ring are connected into a whole by using insulating plates is changed, the possibility of reducing the insulation resistance of the collecting ring upper outer ring and the collecting ring lower outer ring due to the carbon powder pollution is avoided, and the overall safety margin of the generator excitation system is improved.

Set up the locating hole ingeniously on the plate body of the same diameter of last solid fixed ring and lower fixed ring, set for the benchmark hole in the interior ring about making equally, and simultaneously, interior ring plate, all carry out axial positioning through the shaft shoulder on the insulating ring external diameter and prescribe a limit to the axial degree of freedom of lower fixed ring, combine various factors, guarantee that each part can both carry out the one-to-one at the very first time under any dismouting state, the collecting ring central body and upper and lower inner ring installation positioning accuracy have been increased, before having reduced the maintenance back with the axiality deviation of unit rotation center, contact quality and electric conductive property between solid fixed ring about having improved electricity ring carbon brush and collecting ring, effectively reduce the wearing and tearing of carbon brush, the safe and reliable performance.

According to locating hole, the benchmark hole principle of this scheme, go up inner ring, lower inner ring, go up solid fixed ring, solid fixed ring all designs to open components of a whole that can function independently structure down, even also can install fast under the complex environment and overhaul the operation.

According to the scheme, all parts are optimized in detail, the tooth-shaped connecting piers are arranged on the inner ring in the upper inner ring and the lower inner ring, and the tooth-shaped connecting piers of the two fixing rings are arranged in a staggered mode when matched with the upper fixing ring and the lower fixing ring, so that the self weight is reduced, the strength of a component is guaranteed, the maintenance of the collecting ring and the recovery of the collecting ring are facilitated, and the maintenance workload of the collecting ring is reduced.

Compared with the prior art, the invention has the beneficial effects that:

the design of the central body of the collecting ring enables the insulating layer to move inwards, other external insulating treatment is not needed, the complex insulating installation procedures such as additionally installing an insulating pad in the collecting ring installation process are reduced, the collecting ring overhauling working strength is reduced, and the overhauling working efficiency is improved; the rigid positioning design of the upper inner ring, the lower inner ring and the central body of the collecting ring greatly improves the mounting and positioning precision, ensures the roughness of the contact surface of the inner ring and the carbon brush during maintenance, reduces the form and position errors of coaxiality, roundness and the like, and improves the contact performance between the inner ring and the carbon brush; the design of the split outer ring also avoids the risk of reducing the insulation of the generator excitation system due to the attachment of carbon powder of the collecting ring.

This scheme is applicable to all collecting ring designs and installs unreasonable, the big occasion of maintenance work load, and the holistic processing task of collecting ring is accomplished to the accurate characteristics of usable this structure location on standard processing equipment, when improving collecting ring processingquality, also makes collecting ring's manufacturing and maintenance more convenient, nimble.

Drawings

Fig. 1 is a schematic structural view of an installation state of the present invention.

Fig. 2 is a partial enlarged structural view at M of fig. 1.

Fig. 3 is a schematic view of a slip ring hub configuration of the present invention.

Fig. 4 is a sectional view taken along line B-B of fig. 3.

Fig. 5 is a schematic structural view of an inner ring in an assembled state of the present invention.

Fig. 6 is a sectional view taken along line a-a of fig. 5.

Fig. 7 is a schematic view of an outer ring mounting structure of the present invention.

Fig. 8 is a schematic view of an insulating sheath according to the present invention.

Fig. 9 is a schematic view of an inner ring structure of the present invention.

FIG. 10 is a schematic view of an upper retaining ring of the present invention.

FIG. 11 is a view showing the positional relationship between the upper outer ring and the lower outer ring according to the present invention.

In the figure: 1. the novel power generator comprises a lower platform, 2. a generator large shaft, 3. a collecting ring central body, 301. an upper fixing ring, 301a, a left half ring, 301b, a right half ring, 301c, a concave arc screw seat, 301d, a positioning hole, 302. a lower fixing ring, 303. a radial bolt, 304. an insulating washer, 305. an insulating sleeve, 306. an insulating ring, 307. an inner ring plate, 308. a splicing screw group, 4. an inner ring, 401. an upper inner ring, 402. a lower inner ring, 4a, a first half ring, 4b. a second half ring, 4c. a splicing cap group, 4d. a tooth-shaped connecting pier, 5. an external power supply lead, 6. an outer ring, 601. an upper outer ring, 602. a lower outer ring, 603. a carbon brush frame component, 604. an adjusting screw, 605. an insulating component, 606. an outer ring base, 7. a shaft penetrating lead and 8. an upper platform.

Detailed Description

The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.

Referring to fig. 1 to 4, the collector ring of the hydro-generator of the present embodiment is mainly composed of a collector ring central body 3, an inner ring 4 and an outer ring 6.

The collector ring central body 3 includes an inner ring plate 307 fixed on the generator shaft 2, an insulating ring 306 is sleeved on the outer diameter of the inner ring plate 307, an upper fixing ring 301 and a lower fixing ring 302 are installed outside the insulating ring 306, the upper fixing ring 301 and the lower fixing ring 302 are separated by an insulating washer, the inner ring plate 307 is of a sleeve type structure, a shaft shoulder is arranged on the outer diameter of the lower end of the inner ring plate, the insulating ring 306 is positioned through the shaft shoulder, a shaft shoulder is also arranged on the outer diameter of the lower end of the insulating ring 306, the axial freedom degree of the lower fixing ring 302 is limited through the shaft shoulder, an upper group of screw holes and a lower group of screw holes are arranged on the periphery of the inner ring plate 307, corresponding to the upper group of screw holes and the lower group of screw holes are arranged on the insulating ring 306, as shown in fig. 8, the upper fixing ring 301 and the lower fixing ring 302 are of a split type structure, the upper fixing ring 301 is taken as an example, the inner ring plate is composed of a left half ring 301a and a right half ring 301b, and is connected by a combination of split type screw set 308, the upper fixing ring 301 and a lower half ring 302 are both inserted with fasteners L, and are radially connected with the insulating ring plate 307 through a radial type screw bolt 304, and a radial type.

Be equipped with locating hole 301d respectively on the plate body of last fixed ring 301 and the same diameter of lower fixed ring 302, specific way is: two positioning holes 301d are disposed along the apposition center lines of the left half ring 301a and the right half ring 301b. The upper fixing ring 301 and the lower fixing ring 302 which are integrated are respectively provided with 8 connecting holes for rigidly fixing the inner ring 4.

The inner ring 4 is composed of an upper inner ring 401 and a lower inner ring 402 which are arranged in parallel, the upper inner ring 401 and the lower inner ring 402 are both split structures, namely, the inner ring is composed of two half rings of a first half ring 4a and a second half ring 4b, as shown in fig. 9, the two half rings are combined into a whole through a split cap assembly 4c. The inner rings of the upper inner ring 401 and the lower inner ring 402 are internally provided with 8 uniformly distributed tooth-shaped connecting piers 4e, the tooth-shaped connecting piers 4e are matched with 8 connecting holes on the upper fixing ring 301 and the lower fixing ring 302, and during assembly, the tooth-shaped connecting piers 4e in the upper inner ring 401 and the lower inner ring 402 are arranged with the upper fixing ring 301 and the lower fixing ring 302 in a staggered mode, so that the positions of the connecting holes are staggered, and the figure 5 and the figure 6 are shown. Positioning hole configuration: in the upper inner ring 401 and the lower inner ring 402, reference holes 4d that are fitted into the positioning holes 301d in the upper and lower fixing rings are provided along the mating line of the two half rings, respectively.

Further, fixing portions for positioning the through-axis lead 7 are provided symmetrically with respect to the center point in the upper inner ring 401 and the lower inner ring 402.

The outer ring 6 is matched with the upper inner ring 401 and the lower inner ring 402, and the outer ring 6 is of a split structure and comprises an upper outer ring 601 and a lower outer ring 602 which are arranged in central symmetry with the generator large shaft 2 and are staggered up and down. Referring to fig. 7 and 11, the carbon brush holder assemblies 603 are respectively disposed at the upper outer ring 601 and the lower outer ring 602, the upper outer ring 601 and the lower outer ring 602 are respectively connected to the bottom ends of the respective adjusting screws 604, the top ends of the adjusting screws 604 are connected to the outer ring base 606 through the insulating assembly 605, and the outer ring base 606 is fixed on the upper platform 8. The carbon brush holder assembly 603 is connected with an external power lead 5.

When overhauling and installing: since the collector ring central body 3 (including the inner ring plate 307, the upper fixing ring 301 and the lower fixing ring 302, the related assembly of these components is completed in the processing plant, and the complete precision of the complete round matching vehicle is completely guaranteed) is fixed on the generator large shaft 2 between the lower platform 1 and the upper platform 8 in advance, after the installation on site, the structure and the generator large shaft 2 are integrated. And the upper fixing ring 301, the lower fixing ring 302 and the inner ring plate 307 are insulated. The upper inner ring 401 and the lower inner ring 402 of the split structure are rigidly connected with each other through various forms such as standard porous bolts, reference positioning holes and the like, so that the upper inner ring 401 and the lower inner ring 402 are easy and correct to disassemble and assemble.

The above embodiments are illustrative of the present invention, and are not limiting, for example, the inner ring plate 307 and the generator large shaft 2 are configured as an integral structure, and any simple transformed method, process, structure, etc. of the present invention are within the scope of the present invention.

Claims

1. The utility model provides a hydraulic generator collecting ring, includes collecting ring central body (3), characterized by the collecting ring central body is including fixing interior crown plate (307) on generator macroaxis (2), installs upper fixed ring (301) and lower fixed ring (302) of mutual insulation on the interior crown plate external diameter through insulating ring (306), on upper fixed ring and the lower fixed ring respectively rigid connection upper inner ring (401), lower inner ring (402), is equipped with outer ring (6) with upper inner ring, lower inner ring cooperation.

2. The hydro-generator collecting ring according to claim 1, characterized in that the outer ring (6) is a split structure and comprises an upper outer ring (601) and a lower outer ring (602) which are arranged in a central symmetry manner and are staggered up and down with respect to the generator large shaft (2).

3. The collector ring of the hydraulic generator according to claim 1, wherein the plate bodies with the same diameter of the upper fixing ring (301) and the lower fixing ring (302) are respectively provided with a positioning hole (301d), and the upper inner ring (401) and the lower inner ring (402) are respectively provided with a reference hole (4d) matched with the positioning hole.

4. The hydro-generator collecting ring according to claim 1, characterized in that a shaft shoulder is arranged on the outer diameter of the inner ring plate (307), and an insulating ring (306) is positioned through the shaft shoulder; the outer diameter of one end of the insulating ring is also provided with a shaft shoulder, and the axial degree of freedom of the lower fixing ring (302) is limited by the shaft shoulder.

5. The hydro-generator collecting ring according to claim 1, characterized in that the single-side longitudinal sections of the upper fixing ring (301) and the lower fixing ring (302) are both L-shaped structures, and are respectively connected with the inner ring plate (307) through a group of radial bolts (303), and the radial bolts are matched with insulating sleeves (305) and insulating washers (304).

6. The hydro generator collector ring according to claim 1, characterized in that the upper inner ring (401) and the lower inner ring (402) are of split structure, i.e. two half rings, namely a first half ring (4a) and a second half ring (4 b).

7. The hydro-generator collecting ring according to claim 1 or 6, characterized in that a plurality of uniformly distributed tooth-shaped connecting piers (4e) are arranged in the inner rings of the upper inner ring (401) and the lower inner ring (402), and the tooth-shaped connecting piers are matched with the upper fixing ring (301) and the lower fixing ring (302).

8. The hydro-generator collector ring according to claim 7, characterized in that the toothed connecting piers (4e) in the upper inner ring (401) and the lower inner ring (402) are arranged in a staggered manner when being matched with the upper fixing ring (301) and the lower fixing ring (302).

9. The hydro-generator collector ring according to claim 1 or 6, characterized in that fixing parts for positioning the shaft penetrating lead (7) are symmetrically distributed in the upper inner ring (401) and the lower inner ring (402) by a central point.

10. The hydro-generator collecting ring according to claim 1, characterized in that the upper fixing ring (301) and the lower fixing ring (302) are split structures, wherein the upper fixing ring is composed of a left half ring (301a) and a right half ring (301b), and the joint of the upper fixing ring and the inner ring plate (307) is a concave arc screw seat (301 c).