CN201392742Y - Air buffering device and high-voltage vacuum circuit breaker utilizing same - Google Patents
Air buffering device and high-voltage vacuum circuit breaker utilizing same Download PDFInfo
- Publication number
- CN201392742Y CN201392742Y CN200920107548U CN200920107548U CN201392742Y CN 201392742 Y CN201392742 Y CN 201392742Y CN 200920107548 U CN200920107548 U CN 200920107548U CN 200920107548 U CN200920107548 U CN 200920107548U CN 201392742 Y CN201392742 Y CN 201392742Y
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- end cover
- spring
- bottom end
- air buffer
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- 230000003139 buffering effect Effects 0.000 title abstract description 6
- 238000007789 sealing Methods 0.000 claims abstract description 25
- 210000004907 gland Anatomy 0.000 claims description 14
- 230000000712 assembly Effects 0.000 claims description 13
- 238000000429 assembly Methods 0.000 claims description 13
- 238000004146 energy storage Methods 0.000 claims description 10
- 230000007246 mechanism Effects 0.000 claims description 10
- 230000033001 locomotion Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010891 electric arc Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
Disclosed are an air buffering device and a high-voltage vacuum circuit breaker utilizing the same. The air buffering device comprises a connecting block, a piston rod, an upper end cap, a lower end cap, a piston, a sealing ring, an air seal, an air cylinder body and a variable orifice exhausting device, wherein a through hole is arranged in the middle of the connecting block, the piston rod is connected with the connecting block, the upper end and the lower end of the cylinder body are respectively equipped with the upper end cap and the lower end cap, the piston is arranged in an inner cavity of the cylinder body, the piston is provided with an exhaust hole, the air seal is arranged on the upper surface of a central cavity on the lower surface of the piston, the sealing ring is arranged between the cylinder body and the piston, the lower end of the piston rod penetrates through the upper end cap, the piston and the air seal and is fixed with the piston and the air seal, the center of the lower end cap is provided with a through hole, the bottom of the lower end cap is provided with the variable orifice exhausting device, the variable orifice exhausting device comprises a bracket, a spring and a blind plate, the bracket is connected with the bottom of the lower end cap, the spring is arranged on the bottom of an inner cavity of the bracket, the blind plate is arranged at the upper end of the spring, and the upper portion of the blind plate is abutted upon the through hole of the lower end cap. The air buffering device and the high-voltage vacuum circuit breaker utilizing the same can enable curves of switching off characteristics of circuit breakers meet requirements upon electrical specification better.
Description
Technical field
The utility model relates to a kind of high-voltage switch gear field, refers to a kind of air buffer especially and uses the high-pressure vacuum breaker of this device.
Background technology
The splitting lock cushioning device great majority of high-pressure vacuum breaker employing at present adopt oil bumpers, though the sort buffer device is more progressive to some extent than early stage rubber buffer unit, electric property was to the needs of separating brake kinetic characteristic when it still can not satisfy vacuum circuit-breaker and cut-offs.End view and front view with reference to existing high-pressure vacuum breaker shown in Figure 1A and Figure 1B, it comprises operating mechanism 1 ', oil bumper 2 ', major loop 3 ', and main shaft 4 ', oil bumper 2 ' is connected on the main shaft 4 ', operating mechanism 1 ' comprises energy storage component 11 ', divide gate assembly 12 ', four link assemblies 13 ' and Auxiliary Control Element (not shown), main shaft 4 ' is connected with four link assemblies 13 ', energy storage component 11 ' comprises decelerator 111 ', combined floodgate spring 112 ', combined floodgate pallet 113 ', cam 114 ', motor 115 ' and combined floodgate connecting rod 117 ', combined floodgate connecting rod 117 ' is connected with main shaft 4 '.During this breaker closing, motor 115 ' drives decelerator 111 ' rotation and makes the 112 ' energy storage of combined floodgate spring, the bearing 116 ' engagement on combined floodgate pallet 113 ' and the cam 114 ', store energy at this moment.Auxiliary Control Element provides switching signal during breaker closing, and combined floodgate pallet 113 ' is thrown off with bearing 116 ', and energy discharges.117 ' the motion of cam 114 ' pressing brake connection rod, main shaft 4 ' rotates the 13 ' transmission of four link assemblies, breaker closing; The contact spring 31 ' of sluice separating spring 122 ' and major loop 3 ' is compressed energy storage, divide separating brake pallet 121 ' and the 41 ' engagement of the roller on the main shaft 4 ' in the gate assembly 12 ', close a floodgate and keep, during breaker open operation, provide sub-gate signal, separating brake pallet 121 ' is thrown off with roller 41 ', sluice separating spring 122 ' discharges with contact spring 31 ' energy, it is spacing that oil bumper 2 ' is compressed to end separating brake, has simultaneously under the effect of oil bumper 2 ', makes circuit breaker obtain good opening characteristic.
Oil bumper 2 ' in this circuit breaker mainly shows as in the separating brake process: it belongs to the half way buffer in a minute later stage, its opening velocity is too fast, and the separating brake time on earth is short, opens when opening the phase arc extinguishing after causing apart from too big, the Chopping Current height is unfavorable for cut-offfing the little electric current of inductance; Separating brake on earth the time mechanical shock district with after open mutually arc extinguishing area overlapping, to after to open the phase blow-out unfavorable, to single-phase cut-off particularly serious.Therefore need the splitting lock cushioning device of circuit breaker be improved, make the opening characteristic curve of circuit breaker satisfy the performance requirement of each electric equipment.
The utility model content
The purpose of this utility model provides a kind of air buffer and uses the high-pressure vacuum breaker of this device, and it can make the opening characteristic curve of circuit breaker satisfy the requirement of electric property.
In order to realize such scheme, technical solution of the present utility model is: a kind of air buffer, it is characterized in that: comprise contiguous block, piston rod, upper end cover, piston, sealing ring, sealing gland, cylinder block, bottom end cover and variable orifice exhaust apparatus, described contiguous block middle part is provided with through hole, described piston rod upper end is connected and fixed with the contiguous block lower end, described cylinder block upper port is equipped with upper end cover, described cylinder block lower port is equipped with bottom end cover, described piston is arranged at the cylinder block inner chamber, be evenly equipped with several steam vents on the described piston, the cavity upper surface at described piston lower surface center is provided with sealing gland, be provided with sealing ring between described cylinder block and the piston, described piston-rod lower end passes the centre bore of upper end cover, piston center hole and sealing gland also are fixed together with piston and sealing gland, described bottom end cover center is provided with through hole, described bottom end cover bottom is provided with the variable orifice exhaust apparatus, described variable orifice exhaust apparatus comprises bracket, spring and closure plate, described bracket and described bottom end cover bottom are connected and fixed, described spring is arranged at the bracket intracavity bottom, described spring upper end is provided with closure plate, and described closure plate top is against below the through hole of bottom end cover.
The utility model air buffer is provided with Rubber washer between wherein said cylinder block and the bottom end cover.
The utility model air buffer, the through hole at wherein said bottom end cover center are T shape through hole.
The utility model air buffer, wherein said bracket are inverted hat.
The utility model air buffer, wherein said sealing ring inboard is connected with the tensioner spring.
The utility model air buffer is connected and fixed by bolt between wherein said bottom end cover and the bracket.
The utility model air buffer, it is fixing to be spirally connected by bolt between wherein said contiguous block and the piston rod.
A kind of high-pressure vacuum breaker that uses above-mentioned air buffer of the utility model, comprising operating mechanism, major loop and main shaft, main shaft is connected with four link assemblies of operating mechanism and the combined floodgate connecting rod of operating mechanism energy storage component respectively, described four link assemblies are connected with major loop, the connecting lever that has through hole of two symmetries is installed on the main shaft, is connected by connecting axle between described connecting lever and the contiguous block.
The utility model high-pressure vacuum breaker, wherein said major loop comprises outlet, the contact spring, vacuum interrupter, last bellows, last conducting rod, upper contact head, following contact, following bellows reaches conducting rod down, the indoor magnetic shell that is provided with of described vacuum extinction, described magnetic shell is fixed in the outlet, described contact spring upper end is fixed in the outlet, the conducting rod upper end is fixed in its lower end, described upper contact head is fixed in the conducting rod lower end, described contact down is fixed in the upper end of conducting rod down, the described bellows of going up is arranged on the conducting rod, following bellows is arranged at down on the conducting rod, and described conducting rod down is connected with four link assemblies of circuit breaker.
The utility model air buffer is omnidistance buffering, the characteristic that it utilizes air to be easy to compress, the buffering initial stage is minimum to the component velocity influence just of contact under the major loop, along with the piston of air buffer down moves, air constantly is compressed in the cylinder block, resistance increases gradually, the spring of variable orifice exhaust apparatus is compressed gradually, closure plate open gap under spring action of pressure hour variable orifice exhaust apparatus is also little, open gap was just big when pressure was big, made the separating brake motion more meet the requirement of vacuum circuit-breaker to electric property.
Below in conjunction with drawings and Examples the utility model is further specified.
Description of drawings
Figure 1A is the end view of existing high-pressure vacuum breaker;
Figure 1B is the front view of existing high-pressure vacuum breaker;
Fig. 2 A is the "on" position cutaway view of the utility model air buffer;
Fig. 2 B is the gate-dividing state cutaway view of the utility model air buffer;
Fig. 3 is the end view of the utility model air buffer;
Fig. 4 is the front view of the utility model high-pressure vacuum breaker;
Fig. 5 is the end view of the utility model high-pressure vacuum breaker.
Embodiment
See also the "on" position cutaway view and the end view of Fig. 2 A and the utility model air buffer shown in Figure 3, comprise contiguous block 1, piston rod 2, upper end cover 3, piston 4, sealing ring 5, sealing gland 6, cylinder block 7, bottom end cover 8 and variable orifice exhaust apparatus 9.
Piston 4 is arranged at cylinder block 7 inner chambers, is evenly equipped with several steam vents 42 on the piston 4, and cavity 41 upper surfaces at piston 4 lower surface centers are provided with sealing gland 6, are provided with sealing ring 5 between cylinder block 7 and the piston 4, and sealing ring 5 inboards are connected with tensioner spring 50.
Piston rod 2 lower ends are passed centre bore 31, piston 4 centre bores 43 and the sealing gland 6 of upper end cover 3 and are passed through bolt together with piston 4 and sealing gland 6, and bottom end cover 8 centers are provided with T shape through hole 81, and bottom end cover 8 bottoms are provided with variable orifice exhaust apparatus 9.Variable orifice exhaust apparatus 9 comprises bracket 91, spring 92 and closure plate 93, bracket 91 is inverted hat, itself and bottom end cover 8 bottoms are connected and fixed by bolt 40, spring 92 is arranged at bracket 91 intracavity bottoms, spring 92 upper ends are provided with closure plate 93, and closure plate 93 tops are against below the T shape through hole 81 of bottom end cover 8.
See also the front view and the end view of Fig. 4 and the utility model circuit breaker shown in Figure 5, it is the specific embodiment that top air buffer is installed on circuit breaker, this circuit breaker comprises operating mechanism 60, air buffer 70, major loop 80, and main shaft 90, air buffer 70 is identical with foregoing description, repeat no more herein, in conjunction with shown in Figure 3, the connecting lever that has through hole 9,011 901 of two symmetries is installed on the main shaft 90, contiguous block 1 middle part is provided with through hole 11, be connected by connecting axle 100 between connecting lever 901 and the contiguous block 1, operating mechanism 60 comprises energy storage component 601, divide gate assembly 602, four link assemblies 603 and Auxiliary Control Element (not shown), main shaft 90 is connected with four link assemblies 603, energy storage component 601 comprises decelerator 6011, combined floodgate spring 6012, combined floodgate pallet 6013, cam 6014, motor 6015 and combined floodgate connecting rod 6017, combined floodgate connecting rod 6017 is connected with main shaft 90.During this breaker closing, motor 6015 drives decelerator 6011 rotations and makes 6012 energy storage of combined floodgate spring, bearing 6016 engagements on combined floodgate pallet 6013 and the cam 6014, store energy at this moment.Auxiliary Control Element provides switching signal during breaker closing, and combined floodgate pallet 6013 is thrown off with bearing 6016, and energy discharges.6017 motions of cam 6014 pressing brake connection rods, main shaft 90 rotates 603 transmissions of four link assemblies, breaker closing; The contact spring 802 of sluice separating spring 6022 and major loop 80 is compressed energy storage, divide separating brake pallet 6021 and 902 engagements of the roller on the main shaft 90 in the gate assembly 602, close a floodgate and keep, during breaker open operation, provide sub-gate signal, separating brake pallet 6021 is thrown off with roller 902, sluice separating spring 6022 discharges with contact spring 802 energy, it is spacing that air buffer 70 is reduced to end separating brake, under the effect of air buffer 70, makes circuit breaker obtain good opening characteristic.
In conjunction with shown in Figure 5, major loop 80 comprises outlet 801, contact spring 802, vacuum interrupter 803, last bellows 804, last conducting rod 805, upper contact head 806, following contact 807, following bellows 808 reaches conducting rod 809 down, be provided with magnetic shell 8031 in the vacuum interrupter 803, magnetic shell 8031 is fixed in the outlet 801, contact spring 802 upper ends are fixed in the outlet 801, conducting rod 805 upper ends are fixed in its lower end, upper contact head 806 is fixed in conducting rod 805 lower ends, following contact 807 is fixed in the upper end of conducting rod 809 down, last bellows 804 is arranged on the conducting rod 804, following bellows 808 is arranged at down on the conducting rod 808, and following conducting rod 808 is connected with four link assemblies 603 of circuit breaker.
When breaker closing, the main shaft connecting lever 901 of circuit breaker drives contiguous block 1 and moves upward, and sealing gland 6 is opened under the air pressure of piston 4 upper air-vents 42, and circuit breaker is closed a floodgate rapidly, in conjunction with the position shown in Fig. 2 A; During breaker open operation, shown in Fig. 2 B, main shaft connecting lever 901 drives contiguous block 1 and moves downward, sealing gland 6 is blocked up the steam vent on the piston 4 42, because gas can compressed characteristic, do not influence the opening velocity of circuit breaker at the separating brake initial stage, along with the pressure in the cylinder block 7 increases, closure plate 93 in the variable orifice exhaust apparatus 9 is carried out exhaust to lower compression spring 92, according to variation of gas pressure in the cylinder block, closure plate 93 changes with the exhaust clearance of bottom end cover 8 thereupon, reaches the purpose of splitting lock cushioning, thereby obtains " fast-slow-slow " desirable opening characteristic curve.Compress between piston 4 and the bottom end cover 8, separating brake is spacing, and breaker open operation finishes.
Contact spring 802 positions of the utility model high-pressure vacuum breaker major loop 80 are arranged at conducting rod 805 upper ends, changed the structure of existing contact spring position in following conducting rod lower end, make major loop 80 realize going up the two moving of conducting rod 805, following conducting rod 809, discharge in the process of overtravel at contact spring 802, upper contact head 806, following contact 807 are produced the active force that moves downward, upper contact head 806 in the vacuum interrupter 803, down contact 807 just separated at present conducting rod 809 with respect on had separating rate V for the conducting rod 805, make V
0＞0, thus first component velocity improved, so just make starting stage hyperbar electric arc change low pressure electric arc very soon into, alleviated the scaling loss of vacuum interrupter 803 contacts, produce the factor of restriking when having eliminated the high-pressure vacuum breaker switching.
The above embodiment is described preferred implementation of the present utility model; be not that scope of the present utility model is limited; under the prerequisite that does not break away from the utility model design spirit; various distortion and improvement that the common engineers and technicians in this area make the technical solution of the utility model all should fall in the definite protection range of claims of the present utility model.
Claims (9)
1, a kind of air buffer, it is characterized in that: comprise contiguous block (1), piston rod (2), upper end cover (3), piston (4), sealing ring (5), sealing gland (6), cylinder block (7), bottom end cover (8) and variable orifice exhaust apparatus (9), described contiguous block (1) middle part is provided with through hole (11), described piston rod (2) upper end is connected and fixed with contiguous block (1) lower end, described cylinder block (7) upper port is equipped with upper end cover (3), described cylinder block (7) lower port is equipped with bottom end cover (8), described piston (4) is arranged at cylinder block (7) inner chamber, be evenly equipped with several steam vents (42) on the described piston, cavity (41) upper surface at described piston (4) lower surface center is provided with sealing gland (6), be provided with sealing ring (5) between described cylinder block (7) and the piston (4), the centre bore (31) of upper end cover (3) is passed in described piston rod (2) lower end, piston (4) centre bore (43) and sealing gland (6) also are fixed together with piston (4) and sealing gland (6), described bottom end cover (8) center is provided with through hole (81), described bottom end cover (8) bottom is provided with variable orifice exhaust apparatus (9), described variable orifice exhaust apparatus (9) comprises bracket (91), spring (92) and closure plate (93), described bracket (91) is connected and fixed with described bottom end cover (8) bottom, described spring (92) is arranged at bracket (91) intracavity bottom, described spring (92) upper end is provided with closure plate (93), and described closure plate (93) top is against below the through hole (81) of bottom end cover (8).
2, air buffer as claimed in claim 1 is characterized in that: be provided with Rubber washer (30) between described cylinder block (7) and the bottom end cover (8).
3, air buffer as claimed in claim 1 or 2 is characterized in that: the through hole (81) at described bottom end cover (8) center is a T shape through hole.
4, air buffer as claimed in claim 3 is characterized in that: described bracket (91) is inverted hat.
5, air buffer as claimed in claim 4 is characterized in that: described sealing ring (5) inboard is connected with tensioner spring (50).
6, air buffer as claimed in claim 5 is characterized in that: be connected and fixed by bolt (40) between described bottom end cover (8) and the bracket (91).
7, air buffer as claimed in claim 6 is characterized in that: be spirally connected fixing by bolt (20) between described contiguous block (1) and the piston rod (2).
8, a kind of high-pressure vacuum breaker that uses as the described air buffer of one of claim 1 to 7, it is characterized in that: comprise operating mechanism (60), major loop (80) and main shaft (90), main shaft (90) is connected with four link assemblies (603) of operating mechanism and the combined floodgate connecting rod (6017) of operating mechanism (60) energy storage component (601) respectively, described four link assemblies (603) are connected with major loop (80), the connecting lever that has through hole (9011) (901) of two symmetries is installed on the main shaft (90), is connected by connecting axle (100) between described connecting lever (901) and the contiguous block (1).
9, high-pressure vacuum breaker as claimed in claim 8, it is characterized in that: described major loop (80) comprises outlet (801), contact spring (802), vacuum interrupter (803), last bellows (804), last conducting rod (805), upper contact head (806), following contact (807), following bellows (808) reaches conducting rod (809) down, be provided with magnetic shell (8031) in the described vacuum interrupter (803), described magnetic shell (8031) is fixed in the outlet (801), described contact spring (802) upper end is fixed in the outlet (801), conducting rod (805) upper end is fixed in its lower end, described upper contact head (806) is fixed in conducting rod (805) lower end, described contact (807) down is fixed in the upper end of conducting rod (809) down, the described bellows (804) of going up is arranged on the conducting rod (804), following bellows (808) is arranged at down on the conducting rod (808), and described conducting rod (808) down is connected with four link assemblies (603) of circuit breaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920107548U CN201392742Y (en) | 2009-04-27 | 2009-04-27 | Air buffering device and high-voltage vacuum circuit breaker utilizing same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920107548U CN201392742Y (en) | 2009-04-27 | 2009-04-27 | Air buffering device and high-voltage vacuum circuit breaker utilizing same |
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| Publication Number | Publication Date |
|---|---|
| CN201392742Y true CN201392742Y (en) | 2010-01-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200920107548U Expired - Lifetime CN201392742Y (en) | 2009-04-27 | 2009-04-27 | Air buffering device and high-voltage vacuum circuit breaker utilizing same |
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| Country | Link |
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| CN (1) | CN201392742Y (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101840809A (en) * | 2010-03-15 | 2010-09-22 | 常州太平洋电力设备(集团)有限公司 | Vacuum circuit breaker with air cushioning |
| CN102214522A (en) * | 2010-04-12 | 2011-10-12 | 王守林 | Permanent magnet operating mechanism with air opening damping device for high-voltage and low-voltage switches |
| CN104319197A (en) * | 2014-10-28 | 2015-01-28 | 大全集团有限公司 | Gas buffering device used for electromagnetic repulsive force mechanism |
| CN106356211A (en) * | 2016-10-13 | 2017-01-25 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七二研究所） | Gas buffer device for high-speed repulsion mechanism |
| CN107316759A (en) * | 2017-07-19 | 2017-11-03 | 西安交通大学 | A kind of gas cushioning features for electromagnetic repulsion force operating mechanism |
| CN110993381A (en) * | 2019-12-16 | 2020-04-10 | 西安交通大学 | Gas buffering structure with automatic pressure relief function for electromagnetic repulsion mechanism and working method |
| CN113745047A (en) * | 2021-07-01 | 2021-12-03 | 巨东电气有限公司 | Indoor vacuum circuit breaker |
-
2009
- 2009-04-27 CN CN200920107548U patent/CN201392742Y/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101840809A (en) * | 2010-03-15 | 2010-09-22 | 常州太平洋电力设备(集团)有限公司 | Vacuum circuit breaker with air cushioning |
| CN102214522A (en) * | 2010-04-12 | 2011-10-12 | 王守林 | Permanent magnet operating mechanism with air opening damping device for high-voltage and low-voltage switches |
| CN104319197A (en) * | 2014-10-28 | 2015-01-28 | 大全集团有限公司 | Gas buffering device used for electromagnetic repulsive force mechanism |
| CN106356211A (en) * | 2016-10-13 | 2017-01-25 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七二研究所） | Gas buffer device for high-speed repulsion mechanism |
| CN106356211B (en) * | 2016-10-13 | 2019-08-30 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | A kind of high speed repulsive force mechanism gas buffer |
| CN107316759A (en) * | 2017-07-19 | 2017-11-03 | 西安交通大学 | A kind of gas cushioning features for electromagnetic repulsion force operating mechanism |
| CN107316759B (en) * | 2017-07-19 | 2019-07-19 | 西安交通大学 | A kind of gas buffer structure for electromagnetic repulsion force operating mechanism |
| CN110993381A (en) * | 2019-12-16 | 2020-04-10 | 西安交通大学 | Gas buffering structure with automatic pressure relief function for electromagnetic repulsion mechanism and working method |
| CN113745047A (en) * | 2021-07-01 | 2021-12-03 | 巨东电气有限公司 | Indoor vacuum circuit breaker |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: HUADONG SENYAN ELECTRICAL CO., LTD., BEIJING STATE Free format text: FORMER OWNER: HUADONG SENYAN ELECTRICAL CO., LTD., BEIJING Effective date: 20121126 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20121126 Address after: Shuanglong road 401420 Chongqing city Qijiang County Gunan town No. 51 Patentee after: Qinan Power Supply Bureau of Chongqing Power Co. Patentee after: Beijing HuaDong SenYuan Electronic Co., Ltd. Patentee after: State Grid Corporation of China Address before: Shuanglong road 401420 Chongqing city Qijiang County Gunan town No. 51 Patentee before: Qinan Power Supply Bureau of Chongqing Power Co. Patentee before: Beijing HuaDong SenYuan Electronic Co., Ltd. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20100127 |
|
| CX01 | Expiry of patent term |