CN108390495B - Projecting type upper rack structure - Google Patents
Projecting type upper rack structure Download PDFInfo
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- CN108390495B CN108390495B CN201810454639.5A CN201810454639A CN108390495B CN 108390495 B CN108390495 B CN 108390495B CN 201810454639 A CN201810454639 A CN 201810454639A CN 108390495 B CN108390495 B CN 108390495B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000005070 sampling Methods 0.000 claims description 13
- 230000001133 acceleration Effects 0.000 abstract description 9
- 230000005484 gravity Effects 0.000 abstract description 5
- 238000007789 sealing Methods 0.000 abstract description 4
- 238000009434 installation Methods 0.000 abstract description 3
- 239000013535 sea water Substances 0.000 abstract 2
- 238000010612 desalination reaction Methods 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
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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
- F03B11/06—Bearing arrangements
- F03B11/063—Arrangements for balancing axial thrust
- F03B11/066—Arrangements for balancing axial thrust in vertical axis machines
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables
-
- 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)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention relates to an extended upper rack structure which is composed of a central support part, a rack connecting part, an outer rack part and an auxiliary part and is of a six-arm type structure. The invention can shorten the height of the motor, reduce the gravity center of the motor, improve the stability of the vertical asynchronous motor, simplify the wind guiding structure and better maintain the axial and circumferential rigidity; when the earthquake acceleration in the horizontal and vertical directions is not more than 0.2g, the invention can meet the earthquake-resistant requirement to stably run; the lower side is provided with a plurality of fan-shaped windows, so that the installation and the sealing are convenient, and the IP55 sealing requirement is met; when the maximum thrust is 280 tons, the maximum axial deformation of the thrust platform of the structure is not more than 0.82mm and is less than the deflection limit value of 1.5-2.0 mm in the water conservancy industry. The invention is suitable for a high-thrust vertical asynchronous motor structure, in particular to a 280 ton supporting structure for the total thrust of a three-generation nuclear power seawater circulating water pump motor, and can be widely applied to the industries of nuclear power, petrochemical industry, seawater desalination and the like.
Description
Technical Field
The invention belongs to the technical field of motors, and particularly relates to a protruding upper rack structure.
Background
The high-thrust vertical asynchronous motor structure is generally in a suspension type, so that not only is the large water thrust and the motor weight borne, but also the motor height is shortened as much as possible, and the vertical motor obtains better stability. Because the water thrust and the weight of the rotor are all exerted on the upper frame, the upper frame must have good rigidity in the axial direction, and because the motor is wholly suspended and has no radial supporting part, the upper frame must have good circumferential rigidity. The novel invention relates to an extended upper frame structure, which shortens the height of a motor, simplifies an air guide structure, and is convenient to install and seal due to the fact that a plurality of fan-shaped windows are arranged on a lower detection part of the upper frame structure; when the maximum thrust is 280 tons, the maximum axial deformation of the thrust platform of the structure is not more than 0.82mm and is less than the maximum allowable value of the deflection of the thrust bearing bracket in the water conservancy industry standard SL 321-2005 basic technical Condition of large and medium-sized hydraulic generators by 1.5-2.0 mm. The thrust of the general vertical asynchronous motor is less than 50 tons, along with the development of the third-generation nuclear power technology, the required water thrust of the vertical asynchronous motor for the large-scale circulating water pump is 220 tons, the weight of a rotor is 60 tons, and the total thrust of 280 tons is applied to the protruding upper rack structure. The nuclear power station generally selects sites in a weak earthquake activity area, and the medium-to-strong earthquake activities rarely occur, so that the protruding upper rack structure needs to meet certain earthquake-resistant requirements, the maximum horizontal earthquake acceleration at the site of the three-generation nuclear power general site selection is 0.15g, the basic earthquake acceleration is 0.075g, the protruding upper rack structure needs to bear the horizontal earthquake acceleration of 0.2g from the design angle, the vertical earthquake acceleration of 0.2g is borne, and g is the gravity acceleration of the earth; the upper frame structure should be designed to maintain its structural integrity when subjected to seismic loads as specified in national standard GB 18306-2001, regional diagram of chinese seismic parameters. With the improvement of the requirements of the third-generation nuclear power on the simplicity and high reliability of equipment, the rising type upper rack structure has wide application fields.
Disclosure of Invention
The invention aims to provide an extended upper frame structure, which can better maintain the rigidity in the axial direction and the circumferential direction, greatly shorten the whole height of a motor, further reduce the center of gravity of the motor and improve the stability of a vertical motor. The technical scheme of the invention is as follows: the upper stand structure comprises a central support part, a stand connecting part, an outer stand part and an auxiliary part, wherein the upper stand structure is of a six-arm type structure, an upper annular plate (1) is welded on an oil drum (2), the upper annular plate (1) is connected with the upper side of a first upright rib (7), the upper annular plate (1) is connected with the upper side of a second upright rib (3), and the upper annular plate (1) is connected with the side end of an upper top plate (4); the inner circle of the oil cylinder (2) is connected with the outer side of the first stud (7), the outer circle of the oil cylinder (2) is connected with the inner side of the third stud (3), and the oil cylinder (2) is welded on the middle ring plate (9); the backing plate (8) is welded on the middle ring plate (9), the middle ring plate (9) is welded on the fourth vertical ribs (11), the middle ring plate (9) is connected with the upper side of the supporting ring plate (13), and the middle ring plate (9) is connected with the upper side of the fifth vertical ribs (12); the inner side of the second vertical rib (3) is connected with the outer side of the fourth vertical rib (11), the upper side and the outer side of the second vertical rib (3) are connected with the upper top plate (4), the hanging ring (10) is welded on the second vertical rib (3), the lower side of the second vertical rib (3) is connected with the outer ring plate (5), and the lower side of the second vertical rib (3) is connected with the upper side of the lower bottom plate (15); the fourth stud (11) is welded on the lower annular plate (14), the supporting annular plate (13) is connected with the fourth stud (11), the supporting annular plate (13) is welded on the lower annular plate (14), the fifth stud (12) is connected with the fourth stud (11), and the fifth stud (12) is welded on the lower annular plate (14); the outer sides of the lower bottom plates (15) are connected with the outer ring plates (5), the inner sides of the lower bottom plates (15) are connected with the lower ring plates (14), the inner sides of the sector cover plates (16) are connected with the lower ring plates (14), the outer sides of the sector cover plates (16) are connected with the outer ring plates (5), two adjacent lower bottom plates (15) are connected with the sector cover plates (16), and the sector cover plates (16) sink into the first gaps (21) of the lower bottom plates (15); the sampling oil pipe (17) is connected with the oil cylinder (2), the upper side of the sampling oil pipe (17) is connected with the outer joint (18), the outer joint (18) is connected with the external thread water nozzle (19), a second gap (20) is formed between the lower side of the sampling oil pipe (17) and the upper side of the middle ring plate (9), and the oil level gauge connecting pipe (6) is connected with the oil cylinder (2); the first circular arc line (23) is connected with a first linear line segment (25), the first linear line segment (25) is connected with a second circular arc line (24), and the first circular arc line (23), the first linear line segment (25) and the second circular arc line (24) are sequentially connected to form the boundary of the sector cover plate (16); the two first straight line segments (25) are symmetrical about a central line (35), and an included angle (26) is formed between the two first straight line segments (25); a first circle center (33) of the first circular arc line (23) is arranged on a central line (35), a second circle center (32) of the second circular arc line (24) is arranged on the central line (35), two first straight line segments (25) are intersected at a central point (31), a third gap (27) is formed between the first circle center (33) and the second circle center (32), and a fourth gap (34) is formed between the second circle center (32) and the central point (31).
The central bracket part of the invention is mainly responsible for the support function of the oil chamber of the upper frame and the thrust system; the frame connecting part is mainly responsible for connecting the central bracket part with the outer frame part and transmitting thrust to the outer frame part; the outer frame part is mainly responsible for further downward transmission of thrust; the auxiliary part is mainly responsible for the connection of oil sampling and oil level gauge in the bottom of the oil groove of the upper frame.
The central bracket part is mainly responsible for the supporting function of the oil chamber of the upper frame and the thrust system. The upper annular plate (1) is welded on the oil drum (2), the first stud (7) is welded on the inner circular side of the oil drum (2), and the first stud (7) is welded under the upper annular plate (1); the first studs (7) and the oil drum (2) are welded on the middle ring plate (9), and 8 backing plates (8) are uniformly distributed on the circumference and welded on the middle ring plate (9); the middle ring plate (9) is welded on the fourth studs (11), 6 fourth studs (11) are uniformly distributed on the circumference, a supporting ring plate (13) is arranged between every two fourth studs (11), the upper side of the supporting ring plate (13) is welded with the middle ring plate (9), the lower side of the supporting ring plate (13) is welded with the lower ring plate (14), two sides of each fourth stud (11) are respectively welded with a fifth stud (12), 12 fifth studs (12) are uniformly distributed on the circumference, and the fifth studs (12) are welded on the lower ring plate (14); the pressure section (30) is a main thrust bearing part, and the maximum allowable value of the deflection of the thrust bearing bracket in the water conservancy industry standard SL 321-2005 basic technical condition of large and medium-sized hydraulic generators is ensured to be 1.5-2.0 mm by limiting the maximum axial displacement of the pressure section (30).
The frame connecting portion is mainly responsible for connecting the center frame portion with the outer frame portion and transmitting thrust to the outer frame portion. The inner side of the second stud (3) is welded on the outer circle of the oil drum (2), and the inner side of the second stud (3) and the outer side of the fourth stud (11) are connected into a whole through welding; the upper sides of the second studs (3) are respectively welded with the upper annular plate (1) and the upper top plate (4), the outer sides of the upper annular plate (1) are welded with the inner sides of the upper top plate (4), and the lower sides of the second studs (3) are welded with the lower bottom plate (15); two adjacent lower bottom plates (15) are provided with a fan-shaped cover plate (16), the inner side of the fan-shaped cover plate (16) is welded with the outer side of the lower annular plate (14), the outer side of the fan-shaped cover plate (16) is welded with the inner side of the outer annular plate (5), the lower cover plate (16) falls into a first gap (21) of the lower bottom plate (15), and a hanging ring (10) is welded on the second standing bar (3).
The outer frame portion is primarily responsible for conducting thrust further downward. The second studs (3) are welded on the outer ring plate (5), the outer sides of the second studs (3) are welded with the upper top plate (4), and the upper top plate (4) is welded on the outer ring plate (5).
The auxiliary part is mainly responsible for the connection of oil sampling and oil level gauge in the bottom of the oil groove of the upper frame. An oil level gauge connecting pipe (6) is welded on the upper side of the outer circle of the oil cylinder (2), a sampling oil pipe (17) is welded on the lower side of the outer circle of the oil cylinder (2), an outer joint (18) is connected on the outer side of the sampling oil pipe (17), and an external thread water nozzle (19) is continuously connected on the outer side of the outer joint (18).
When the acceleration in the horizontal direction of the earthquake is not more than 0.2g, and the acceleration in the vertical direction of the earthquake is not more than 0.2g, the structure of the invention meets the earthquake-proof requirement; meanwhile, a plurality of fan-shaped windows are arranged at the lower part of the protruding upper rack structure, so that the installation and the sealing are convenient; when the maximum thrust is 280 tons, the maximum axial deformation of the thrust platform of the structure is not more than 0.82mm and is less than the maximum limit value of the water conservancy industry standard of 1.5-2.0 mm.
The invention provides a protruding type upper frame structure for a high-thrust vertical asynchronous motor, which adopts a six-arm type structure, and can shorten the height of the motor, reduce the gravity center of the motor and further improve the stability of the vertical asynchronous motor through a specially arranged lower detection structure. The invention provides a downward-detecting structure with an inclination angle, namely, the lower bottom plate (15) welded at the lower side of the second stud (3) is provided with a certain inclination angle, so that the air guide structure can also serve as an air guide function, and the frame can be kept to have good rigidity in the axial direction and the circumferential direction. The protruding type upper frame structure can meet the requirements of a nuclear power station on equipment and support vibration resistance when the earthquake acceleration in the horizontal and vertical directions is not more than 0.2g, a plurality of fan-shaped windows are arranged at the lower detection positions, the installation and the sealing are convenient, the technical requirements of ensuring that the inside of a motor reaches the IP55 (dustproof and harmless influence caused by water spraying in any direction) grade in GB/T4942.1 of the protection grade (IP code) grade of the integral structure of the rotating motor are met, and the maximum axial deformation of a thrust platform of the structure is not more than 0.82mm and is less than the maximum limit value of 1.5-2.0 mm of the water conservancy industry standard. The invention breaks through the problem that the traditional vertical asynchronous motor has overlarge motor height value due to the adoption of a non-downward-penetrating type frame, avoids the poor stability caused by overhigh gravity center, can improve the operation reliability of the high-thrust vertical asynchronous motor, and reduces the complexity of repairing and installing.
Drawings
FIG. 1 is a schematic diagram of the structure of an upper frame of the present invention
FIG. 2 is a cross-sectional view A-A of FIG. 1
FIG. 3 is a B-B cross-sectional view of FIG. 2
FIG. 4 is an enlarged view of FIG. 2
FIG. 5 is an enlarged view of FIG. 2 II
FIG. 6 is an enlarged view of item 16 of FIG. 1
FIG. 7 is a graph of maximum thrust axial displacement of item 30 of FIG. 2
Detailed Description
Fig. 1 shows an extended upper frame structure, which is composed of a central support part, a frame connecting part, an outer frame part and an auxiliary part, and is in a six-arm type structure. The invention discloses an upper frame structure which is used in a thrust supporting structure of a circulating water pump motor with the maximum thrust of 280 tons.
As shown in fig. 1, in the protruding type upper frame structure, an oil drum 2 is welded with a second stud 3, an upper fixed plate 4 is welded on the second stud 3, 6 studs are uniformly distributed on the circumference of the second stud 3, 8 gaskets are uniformly distributed on the circumference of a backing plate 8 and welded on a pressure zone 30, 6 studs are uniformly distributed on the circumference of a first stud 7 and welded on the inner circle of the oil drum 2, fifth studs 12 are oppositely arranged, 12 studs 12 are circumferentially arranged in total, 12 lower base plates 15 are circumferentially arranged, 6 lower base plates 15 are welded with the second stud 3, and 1 fan-shaped cover plate 16 is arranged between every two lower base plates 15.
As shown in fig. 2, which is a sectional view A-A of fig. 1, an upper ring plate 1 is welded on an oil drum 2, the upper ring plate 1 is welded on the upper side of a second stud 3, the upper ring plate 1 is welded on the side end of an upper top plate 4, a first stud 7 is welded on the inner side of the oil drum 2, the upper ring plate 1 is welded on the upper side of the first stud 7, the second stud 3 is welded on the outer side of the oil drum 2, the outer circle of the oil drum 2 is welded on the inner side of a third stud 3, the oil drum 2 is welded on a middle ring plate 9, the upper top plate 4 is welded on the second stud 3, a hanging ring 10 is welded on the second stud 3, and an oil level gauge connecting pipe 6 is welded with the oil drum 2; the backing plate 8 is welded on the middle ring plate 9, the middle ring plate 9 is welded on the fourth stud 11, the middle ring plate 9 is welded on the upper side of the supporting ring plate 13, and the middle ring plate 9 is welded on the upper side of the fifth stud 12; the inner side of the second stud 3 is welded with the outer side of the fourth stud 11, the upper side and the outer side of the second stud 3 are welded with the upper top plate 4, the lower side of the second stud 3 is welded with the outer annular plate 5, and the lower side of the second stud 3 is welded with the upper side of the lower bottom plate 15; the fourth stud 11 is welded on the lower ring plate 14, the support ring plate 13 is welded with the fourth stud 11, the support ring plate 13 is welded on the lower ring plate 14, the fifth stud 12 is welded with the fourth stud 11, and the fifth stud 12 is welded on the lower ring plate 14; the outer side of the lower bottom plate 15 is welded with the outer ring plate 5, the inner side of the lower bottom plate 15 is welded with the lower ring plate 14, the inner side of the lower cover plate 16 is welded with the lower ring plate 14, the outer side of the lower cover plate 16 is welded with the outer ring plate 5, and two adjacent lower bottom plates 15 are welded with the lower cover plate 16.
As shown in fig. 3, which is a cross-sectional view B-B of fig. 2, a hanging ring 10 is welded to both sides of the second stud 3.
As shown in fig. 4, in the enlarged view of fig. 2, the sampling oil pipe 17 is welded to the oil cylinder 2, the upper side of the sampling oil pipe 17 is connected to the outer joint 18 in a threaded fit manner, the outer joint 18 is connected to the outer threaded water nozzle 19 in a threaded fit manner, a second gap 20 is provided between the lower side of the sampling oil pipe 17 and the upper side of the middle ring plate 9, and the second gap 20 is 10mm.
As shown in fig. 5, which is an enlarged view of fig. 2, the inner side of the cover plate 16 is welded to the lower ring plate 14, the outer side of the cover plate 16 is welded to the outer ring plate 5, and the cover plate 16 is lowered into the lower bottom plate 15 by a first gap 21, and the first gap 21 is 6mm.
As shown in fig. 6, which is an enlarged view of the item 16 in fig. 1, the first circular arc 23 is connected with a first linear segment 25, the first linear segment 25 is connected with a second circular arc 24, and the first circular arc 23, the first linear segment 25 and the second circular arc 24 are sequentially connected to form the boundary of the sector cover plate 16; the two first straight lines 25 are symmetrical about the central line 35, an included angle 26 is formed between the two first straight lines 25, and the included angle 26 is 26.8 degrees; the first circle center 33 of the first circular arc line 23 is on the central line 35, the second circle center 32 of the second circular arc line 24 is on the central line 35, the two first straight line sections 25 are intersected at the central point 31, a third gap 27 exists between the first circle center 33 and the second circle center 32, the third gap 27 is 310mm, a fourth gap 34 exists between the second circle center 32 and the central point 31, the fourth gap 34 is 188mm, the first circular arc radius 28 is R1309mm, and the second circular arc radius 39 is R1938mm.
As shown in FIG. 7, which is a maximum thrust axial displacement diagram of the item 30 in FIG. 2, when the total thrust is 280 tons, the thrust is applied to the pressure interval 30, the axial deformation of the pressure interval 30 is 0.6773-0.8173 mm from outside to inside, the axial deformation of the outer side of the pressure interval 30 is 0.6773mm at the minimum, and the axial deformation of the inner side of the pressure interval 30 is 0.8173mm at the maximum, so that the maximum axial deformation of the upper frame structure is not more than 0.82mm and is less than the maximum deflection limit value of 1.5-2.0 mm required by the water conservancy industry standard.
Claims (1)
1. An upper frame structure of stretching out formula, characterized by: the oil cylinder comprises a central support part, a frame connecting part, an outer frame part and an auxiliary part, wherein the protruding upper frame structure is of a six-arm type structure, an upper annular plate (1) is welded on an oil cylinder (2), the upper annular plate (1) is connected with the upper side of a first upright rib (7), the upper annular plate (1) is connected with the upper side of a second upright rib (3), and the upper annular plate (1) is connected with the side end of an upper top plate (4); the inner circle of the oil cylinder (2) is connected with the outer side of the first stud (7), the outer circle of the oil cylinder (2) is connected with the inner side of the third stud, and the oil cylinder (2) is welded on the middle ring plate (9); the backing plate (8) is welded on the middle ring plate (9), the middle ring plate (9) is welded on the fourth vertical ribs (11), the middle ring plate (9) is connected with the upper side of the supporting ring plate (13), and the middle ring plate (9) is connected with the upper side of the fifth vertical ribs (12); the inner side of the second vertical rib (3) is connected with the outer side of the fourth vertical rib (11), the upper side and the outer side of the second vertical rib (3) are connected with the upper top plate (4), the hanging ring (10) is welded on the second vertical rib (3), the lower side of the second vertical rib (3) is connected with the outer ring plate (5), and the lower side of the second vertical rib (3) is connected with the upper side of the lower bottom plate (15); the fourth stud (11) is welded on the lower annular plate (14), the supporting annular plate (13) is connected with the fourth stud (11), the supporting annular plate (13) is welded on the lower annular plate (14), the fifth stud (12) is connected with the fourth stud (11), and the fifth stud (12) is welded on the lower annular plate (14); the outer sides of the lower bottom plates (15) are connected with the outer ring plates (5), the inner sides of the lower bottom plates (15) are connected with the lower ring plates (14), the inner sides of the sector cover plates (16) are connected with the lower ring plates (14), the outer sides of the sector cover plates (16) are connected with the outer ring plates (5), two adjacent lower bottom plates (15) are connected with the sector cover plates (16), and the sector cover plates (16) sink into the first gaps (21) of the lower bottom plates (15); the sampling oil pipe (17) is connected with the oil cylinder (2), the upper side of the sampling oil pipe (17) is connected with the outer joint (18), the outer joint (18) is connected with the external thread water nozzle (19), a second gap (20) is formed between the lower side of the sampling oil pipe (17) and the upper side of the middle ring plate (9), and the oil level gauge connecting pipe (6) is connected with the oil cylinder (2); the first circular arc line (23) is connected with a first linear line segment (25), the first linear line segment (25) is connected with a second circular arc line (24), and the first circular arc line (23), the first linear line segment (25) and the second circular arc line (24) are sequentially connected to form the boundary of the sector cover plate (16); the two first straight line segments (25) are symmetrical about a central line (35), and an included angle (26) is formed between the two first straight line segments (25); a first circle center (33) of the first circular arc line (23) is arranged on a central line (35), a second circle center (32) of the second circular arc line (24) is arranged on the central line (35), two first straight line segments (25) are intersected at a central point (31), a third gap (27) is formed between the first circle center (33) and the second circle center (32), and a fourth gap (34) is formed between the second circle center (32) and the central point (31).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810454639.5A CN108390495B (en) | 2018-05-14 | 2018-05-14 | Projecting type upper rack structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810454639.5A CN108390495B (en) | 2018-05-14 | 2018-05-14 | Projecting type upper rack structure |
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| CN108390495A CN108390495A (en) | 2018-08-10 |
| CN108390495B true CN108390495B (en) | 2023-12-01 |
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| US8599513B1 (en) * | 2012-05-30 | 2013-12-03 | Nidec Corporation | Bearing mechanism, motor, and disk drive apparatus |
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