CN113417786A - Double-support circular top cover structure of water turbine - Google Patents
Double-support circular top cover structure of water turbine Download PDFInfo
- Publication number
- CN113417786A CN113417786A CN202110922430.9A CN202110922430A CN113417786A CN 113417786 A CN113417786 A CN 113417786A CN 202110922430 A CN202110922430 A CN 202110922430A CN 113417786 A CN113417786 A CN 113417786A
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- CN
- China
- Prior art keywords
- top cover
- seat ring
- connecting bolt
- double
- main shaft
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B11/00—Parts or details not provided for in, or of interest apart from, the preceding groups, e.g. wear-protection couplings, between turbine and generator
- F03B11/02—Casings
- F03B11/025—Covers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B11/00—Parts or details not provided for in, or of interest apart from, the preceding groups, e.g. wear-protection couplings, between turbine and generator
- F03B11/006—Sealing arrangements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Hydraulic Turbines (AREA)
Abstract
The invention discloses a double-support circular top cover structure of a water turbine, which consists of a seat ring, a top cover, a nut, a top cover connecting bolt, a sealing strip, a rotating wheel, a water guide bearing, a main shaft and a volute; the seat ring is positioned inside the volute, the top cover is fixedly connected with the seat ring through a top cover connecting bolt and a nut, the water guide bearing is fixed inside the top cover, the lower end of the main shaft is connected with the rotating wheel, and the other end of the main shaft is connected with the water guide bearing. The circular top cover structure fills the gap between the top cover and the seat ring and can play a role in guiding in the process of assembling the top cover; the double-support mode of the radial force of the unit is realized, the stress state of the top cover connecting bolt is improved, the safety of the unit is improved, and the service life of the top cover connecting bolt is prolonged; especially when top cap connecting bolt is not hard up or became invalid, reduce the overflow volume of pressurized water from between top cap and the seat ring, improve the power station safe operation coefficient.
Description
Technical Field
The invention relates to a double-support circular top cover structure of a water turbine, and belongs to the field of fluid machinery.
Background
The water turbine is used as a prime motor of the hydroelectric generating set and is used for converting the mechanical energy of water into rotary kinetic energy which can be used by a generator. Because the water turbine can operate under different water heads and different working conditions, the unit has a large operating range with load, is frequently started and stopped, and can often operate under a non-optimal working condition, the top cover is acted by the water pressure from the flow channel, and the water pressure is transmitted to the top cover connecting bolt by the top cover, so that the top cover connecting bolt bears alternating tensile stress. Meanwhile, the rotation of the main shaft can generate alternating radial force with a certain period in the rotating process of the rotating wheel, and the radial force is finally transmitted to the top cover connecting bolt through the water guide bearing and the top cover, so that the top cover connecting bolt is subjected to an alternating torque effect. Under the effect of these two power, the risk that top cap connecting bolt became invalid increases, and top cap connecting bolt's life reduces. Therefore, the hydraulic turbine top cover structure is urgently needed to optimize the stress state of the top cover connecting bolts, the phenomenon that the fatigue looseness of the top cover connecting bolts causes unit vibration aggravation, the safe operation of a power station is influenced, and even the personal safety of power station workers is endangered is avoided.
Fig. 1 shows a conventional top cover connection structure of a hydroelectric generating set, which comprises a rotating wheel, a main shaft, a water guide bearing, a top cover, a seat ring, a volute, a top cover connection bolt and a nut. The seat ring is positioned in the volute and plays a supporting role for the whole unit, and in practical engineering application, due to the fact that the sizes of the top cover and the seat ring are large, enough radial gaps are usually reserved between the top cover and the seat ring for guaranteeing smooth assembly. The top cover is fixedly connected with the seat ring through a top cover connecting bolt and a nut, the water guide bearing is fixed inside the top cover, one end of the main shaft is connected with the rotating wheel, and the other end of the main shaft is connected with the water guide bearing. When the water turbine works, water flow enters from the volute, flows through the seat ring and the top cover and then enters the rotating wheel, and pushes the rotating wheel to rotate to do work; the radial force borne by the rotating wheel can be transmitted to the water guide bearing and the top cover through the main shaft and finally transmitted to the top cover connecting bolt, so that the top cover connecting bolt bears an alternating radial force. In addition, the sealing strip is installed between top cap flange lower extreme face and seat ring up end for the interior high pressure water of sealed runner, and when top cap connecting bolt becomes flexible or became invalid the back sealing strip compact size reduces, and the high pressure water can flow into sealed face and then spill over through the radial clearance between top cap, seat ring, increases the unit operation risk.
Disclosure of Invention
In view of the above, the present invention discloses a double-support circular top cover structure of a water turbine, which can fill a gap between a top cover and a seat ring, and can play a role in guiding during the assembly of the top cover, thereby realizing a radial force double-support mode of the turbine, improving the stress state of a top cover connecting bolt, and improving the safety of the turbine. The technical scheme of the invention is described as follows: a double-support circular top cover structure of a water turbine consists of a seat ring, a top cover, a nut, a top cover connecting bolt, a sealing strip, a rotating wheel, a water guide bearing, a main shaft and a volute; the seat ring is positioned inside the volute, the top cover is fixedly connected with the seat ring through a top cover connecting bolt and a nut, the water guide bearing is fixed inside the top cover, the lower end of the main shaft is connected with the rotating wheel, and the other end of the main shaft is connected with the water guide bearing.
In the above-mentioned double-support circular top cover structure of the water turbine, the cylindrical surface of the top cover has an annular structure with a semicircular section.
In the double-support circular top cover structure of the water turbine, the semicircular annular structure on the cylindrical surface of the top cover is tangent to the lower end surface of the top cover.
In the double-support circular top cover structure of the water turbine, the difference between the sum of the radius of the semicircular section on the cylindrical surface of the top cover and the radius of the inner cylindrical surface of the seat ring is 10-20 mm.
The beneficial technical effects of the invention are as follows:
1. the radial force generated by the unit during operation is jointly borne by the top cover connecting bolt and the semicircular annular structure on the cylindrical surface of the top cover; the original single fulcrum stress is changed into the existing double fulcrum stress, the stress state of the top cover connecting bolt is improved, the safety of the unit is improved, and the service life of the top cover connecting bolt is prolonged.
2. When the top cover connecting bolt is loosened or fails, the gap between the top cover and the seat ring is filled by the semicircular annular structure on the cylindrical surface of the top cover, so that the overflowing area is reduced, the overflowing amount of pressure water between the top cover and the seat ring is further reduced, and the safe operation coefficient of the power station is improved.
Drawings
FIG. 1 is a diagram of a conventional roof connection structure of a hydroelectric generating set;
FIG. 2 is a top cover connection block diagram of the present invention;
FIG. 3 is a top cover construction of the present invention;
fig. 4 is a block diagram of a hydroelectric generating set seat ring.
The notation in the figure is: 1-a seat ring; 2-a top cover; 3-a nut; 4-top cover connecting bolts; 5-sealing strips; 6-rotating wheel; 7-water guide bearing; 8-a main shaft; 9-a volute; 11-semi-circular ring structure on the cylindrical surface 12 of the top cover 2; 12-cylindrical surface of the top 2; 13-the inner cylindrical surface of the seat ring 1.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
As shown in fig. 2, a double-support circular top cover structure of a water turbine comprises a seat ring 1, a top cover 2, a nut 3, a top cover connecting bolt 4, a sealing strip 5, a runner 6, a water guide bearing 7, a main shaft 8 and a volute 9. The seat ring 1 is positioned in the volute 9 and plays a supporting role for the whole unit, the top cover 2 is fixedly connected with the seat ring 1 through the top cover connecting bolt 4 and the nut 3, the water guide bearing 7 is fixed in the top cover 2, the lower end of the main shaft 8 is connected with the rotating wheel 6, and the other end of the main shaft is connected with the water guide bearing 7.
As shown in figure 3, the cylindrical surface 12 of the top cover 2 is provided with a semicircular annular structure 11 with a cross section, and the lower part of the semicircular annular structure 11 is tangent to the lower end surface of the top cover 2.
The difference between the sum of the radius of the cylindrical surface 12 of the top cover 2 and the radius of the semicircular annular structure 11 and the radius of the inner cylindrical surface 13 of the seat ring 1 as shown in fig. 3 and 4 is 10 mm to 20 mm, namely, the following relation is satisfied:
10≤R2-r-R1≤20
in the formula: r is the radius of the semicircular annular structure 11 in millimeters;
r1 is the radius in mm of the cylindrical surface 12 of the top 2;
r2 is the radius in millimeters of the inner cylindrical surface 13 of the seating ring 1.
The working principle is as follows: the double-support circular top cover structure of the water turbine can share the radial force generated during the operation of a unit with the top cover connecting bolt, and changes the stress of a single pivot into the stress of double pivots, so that the stress state of the top cover connecting bolt is improved, the safety of the unit is improved, and the service life of the top cover connecting bolt is prolonged. In the top cover assembling process, the semi-circular annular structure on the top cover cylindrical surface can play a role in guiding, so that the top cover can be assembled conveniently. When the top cover falls into the seat ring, the coaxiality of the top cover and the seat ring needs to be adjusted, and the central position of the top cover is adjusted by taking the semicircular annular structure on the cylindrical surface of the top cover as a fulcrum, so that the top cover is coaxially connected with the seat ring. When the top cover connecting bolt is loosened or fails, the gap between the top cover and the seat ring is filled up due to the semicircular annular structure on the cylindrical surface of the top cover, so that the overflow amount of pressure water from the top cover to the seat ring is reduced, and the safe operation coefficient of the power station is improved.
Finally, the scope of protection of the invention is not limited to the embodiments described above. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the scope or spirit of the invention. It is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.
Claims (4)
1. The utility model provides a circular roof structure of hydraulic turbine dual bracing which characterized in that: the device comprises a seat ring (1), a top cover (2), a nut (3), a top cover connecting bolt (4), a sealing strip (5), a rotating wheel (6), a water guide bearing (7), a main shaft (8) and a volute (9); the seat ring (1) is located inside the volute (9), the top cover (2) is fixedly connected with the seat ring (1) through a top cover connecting bolt (4) and a nut (3), the water guide bearing (7) is fixed inside the top cover (2), the lower end of the main shaft (8) is connected with the rotating wheel (6), and the other end of the main shaft is connected with the water guide bearing (7).
2. The double-support circular top cover structure of the water turbine as claimed in claim 1, wherein: the cylindrical surface (12) of the top cover (2) is provided with a ring structure (11) with a semicircular cross section.
3. The double-support circular top cover structure of the water turbine as claimed in claim 1, wherein: the upper semicircular annular structure (11) of the cylindrical surface (12) of the top cover (2) is tangent to the lower end surface of the top cover (2).
4. The double-support circular top cover structure of the water turbine as claimed in claim 1, wherein: the difference between the sum of the radius of the semicircular annular structure (11) on the cylindrical surface (12) of the top cover (2) and the radius of the inner cylindrical surface (13) of the seat ring (1) is 10-20 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110922430.9A CN113417786A (en) | 2021-08-12 | 2021-08-12 | Double-support circular top cover structure of water turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110922430.9A CN113417786A (en) | 2021-08-12 | 2021-08-12 | Double-support circular top cover structure of water turbine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113417786A true CN113417786A (en) | 2021-09-21 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110922430.9A Pending CN113417786A (en) | 2021-08-12 | 2021-08-12 | Double-support circular top cover structure of water turbine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113417786A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1064367A (en) * | 1975-04-21 | 1979-10-16 | Allis-Chalmers Corporation | Circular stay ring for rotary fluid machine |
| US4380401A (en) * | 1981-05-15 | 1983-04-19 | Allis-Chalmers Corporation | Bearing support |
| US20030182798A1 (en) * | 2002-03-27 | 2003-10-02 | Hitachi, Ltd. | Method of converting storage pumps into reversible pump-turbines |
| CN202417786U (en) * | 2011-12-30 | 2012-09-05 | 重庆水轮机厂有限责任公司 | Tool socket ring for preassembling water guide mechanism of water turbine |
| CN107269445A (en) * | 2017-06-16 | 2017-10-20 | 哈尔滨电机厂有限责任公司 | Hydropower Unit top cover safety protection structure |
| CN109958570A (en) * | 2019-03-18 | 2019-07-02 | 哈尔滨电机厂有限责任公司 | A kind of top cover safe connection structure of high water head hydraulic |
| CN213627844U (en) * | 2020-10-26 | 2021-07-06 | 哈尔滨电机厂有限责任公司 | Upper flange top cover closing and pre-tightening structure for high-water-head unit |
-
2021
- 2021-08-12 CN CN202110922430.9A patent/CN113417786A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1064367A (en) * | 1975-04-21 | 1979-10-16 | Allis-Chalmers Corporation | Circular stay ring for rotary fluid machine |
| US4380401A (en) * | 1981-05-15 | 1983-04-19 | Allis-Chalmers Corporation | Bearing support |
| US20030182798A1 (en) * | 2002-03-27 | 2003-10-02 | Hitachi, Ltd. | Method of converting storage pumps into reversible pump-turbines |
| CN202417786U (en) * | 2011-12-30 | 2012-09-05 | 重庆水轮机厂有限责任公司 | Tool socket ring for preassembling water guide mechanism of water turbine |
| CN107269445A (en) * | 2017-06-16 | 2017-10-20 | 哈尔滨电机厂有限责任公司 | Hydropower Unit top cover safety protection structure |
| CN109958570A (en) * | 2019-03-18 | 2019-07-02 | 哈尔滨电机厂有限责任公司 | A kind of top cover safe connection structure of high water head hydraulic |
| CN213627844U (en) * | 2020-10-26 | 2021-07-06 | 哈尔滨电机厂有限责任公司 | Upper flange top cover closing and pre-tightening structure for high-water-head unit |
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| PB01 | Publication | ||
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Application publication date: 20210921 |