CN110043335B - Annular multistage temperature and pressure reducing device matched with turbine bypass system - Google Patents
Annular multistage temperature and pressure reducing device matched with turbine bypass system Download PDFInfo
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- CN110043335B CN110043335B CN201910365402.4A CN201910365402A CN110043335B CN 110043335 B CN110043335 B CN 110043335B CN 201910365402 A CN201910365402 A CN 201910365402A CN 110043335 B CN110043335 B CN 110043335B
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- expansion
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- pipe
- diffuser pipe
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/08—Cooling; Heating; Heat-insulation
- F01D25/12—Cooling
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/30—Exhaust heads, chambers, or the like
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/005—Pipe-line systems for a two-phase gas-liquid flow
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Turbines (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention belongs to the field of steam turbines, and particularly relates to an annular multistage temperature and pressure reducing device matched with a bypass system of a steam turbine. The device comprises a cylinder body, a pressure reducing mechanism and a temperature reducing mechanism, wherein the pressure reducing mechanism comprises a steam diffuser pipe, an expansion diffuser pipe and a supporting rod, and the supporting rod is fixed in the cylinder body; the steam diffuser pipe transversely penetrates through the supporting rod to be fixed in the cylinder body, and a half side of the steam diffuser pipe is provided with an opening; the expansion diffuser pipe is a semicircular annular plate, a multistage expansion diffuser pipe is arranged, the radius of the multistage expansion diffuser pipe is larger than that of the steam diffuser pipe, the multistage expansion diffuser pipe is fixed on one side with the opening of the steam diffuser pipe, then the expansion diffuser pipes at all stages are sequentially fixed in an alternating arrangement mode on one side without the opening of the steam diffuser pipe and one side with the opening of the steam diffuser pipe, the radius of the expansion diffuser pipe at the rear stage is larger than that of the expansion diffuser pipe at the front stage, and a gap is reserved at the connecting part of the support rod and the end part of the expansion diffuser pipe; the temperature reducing mechanism comprises two temperature reducing water inlets. The device has simple structure, small size and good temperature and pressure reducing effect.
Description
Technical Field
The invention belongs to the technical field of steam turbines, and particularly relates to an annular multistage temperature and pressure reducing device matched with a bypass system of a steam turbine.
Background
The bypass system of the turbine unit is provided with a temperature and pressure reducing device, and the bypass system is used for reducing the temperature and pressure of the high-temperature and high-pressure steam which is bypassed to the allowable value of the condenser and the exhaust cylinder when the turbine is started or is subjected to load shedding, and then the high-temperature and high-pressure steam is discharged into the condenser. The condenser generally needs to receive about 70% of the evaporation capacity of the boiler, so in theory, when the turbine unit is totally in load shedding, not only almost all new steam, but also vaporized steam for the temperature reduction and water spraying of the bypass equipment needs to be discharged into the condenser, and therefore, the bypass temperature reduction and pressure reduction device is required to have enough through-flow capacity. Meanwhile, with the increase of the external dimension and the weight of the temperature and pressure reducing device, the arrangement problem of the temperature and pressure reducing device at the throat part of the condenser is seriously influenced. In addition to the design problem of the bypass steam temperature and pressure reducing device with large size and weight, the influence of the bypass steam discharge amount on the operation pressure of the condenser, especially under the condition of high cooling water temperature, must be calculated.
Disclosure of Invention
First, the technical problem to be solved
Aiming at the existing technical problems, the invention provides the annular multistage temperature and pressure reduction device matched with the turbine bypass system, which has the advantages of simple structure, small size and independent operation without adding a power supply, and can reduce the parameters of high-temperature and high-pressure steam bypassed to the acceptable range of a condenser.
(II) technical scheme
In order to achieve the above purpose, the main technical scheme adopted by the invention comprises the following steps:
an annular multistage temperature and pressure reducing device matched with a turbine bypass system comprises a cylinder body, a pressure reducing mechanism and a temperature reducing mechanism,
the pressure reducing mechanism comprises a steam diffusion pipe, an expansion diffusion pipe and a supporting rod, and the supporting rod is vertically fixed in the cylinder body;
the steam diffuser pipe transversely penetrates through the supporting rod to be fixed in the cylinder body, and a part of the steam diffuser pipe in the cylinder body is provided with a half side hole;
the expansion diffusion pipes are annular plates with semicircular structures, the two sides of the steam diffusion pipes, which are bounded by the support rods, are provided with multi-stage expansion diffusion pipes, the radius of each of the two-stage expansion diffusion pipes is larger than that of the steam diffusion pipe, the two-stage expansion diffusion pipes are fixed on one side of the support rods, which is provided with holes with the steam diffusion pipes, and then the expansion diffusion pipes at all stages are sequentially fixed on the support rods in an alternating arrangement mode of one side of the support rods, which is not provided with holes with the steam diffusion pipes, and one side of the support rods, which is provided with holes with the steam diffusion pipes, the radius of each of the expansion diffusion pipes at the later stage is larger than that of the expansion diffusion pipes at the previous stage, and a gap is reserved at the connection part of the support rods and the ends of the expansion diffusion pipes;
the temperature reducing mechanism comprises two temperature reducing water inlets which are respectively arranged at the upper part and the lower part of the cylinder body at one side of the air outlet of the expansion diffuser pipe at the last stage.
Specifically, the decompression mechanism further comprises a supporting plate transversely fixed in the cylinder body and used for fixing the expansion diffuser pipe.
Specifically, the water inlet of the temperature reducing water inlet is connected with an external pipeline through a flange of the temperature reducing water inlet, and a certain number of small holes are formed in the water spraying pipeline, so that the temperature reducing water is sprayed out in a spraying state through the small holes.
Specifically, the opening radius of the steam diffuser pipe, the radius of each stage of expansion diffuser pipe, the size of a gap at the joint of the support rod and the end part of the expansion diffuser pipe and the water spraying amount of the temperature reducing water inlet are all obtained through calculation.
Specifically, two lifting lugs are respectively arranged at the upper part and the lower part of the cylinder body for lifting and installing the device.
Specifically, the inlet of the steam diffuser pipe is connected with an external pipeline through a steam diffuser pipe inlet flange.
Specifically, the expansion diffuser pipes include a primary expansion diffuser pipe, a secondary expansion diffuser pipe, a tertiary expansion diffuser pipe, a quaternary expansion diffuser pipe, a penta-stage expansion diffuser pipe, a hexa-stage expansion diffuser pipe, a hepta-stage expansion diffuser pipe, and an octa-stage expansion diffuser pipe.
Specifically, the annular multistage temperature and pressure reduction device is integrally welded at the throat part of the condenser.
(III) beneficial effects
The beneficial effects of the invention are as follows: the annular multistage temperature and pressure reduction device matched with the turbine bypass system provided by the invention adopts an annular structure to carry out nine-stage pressure reduction and one-stage temperature reduction, has a simple structure, can independently operate without adding a power supply, simultaneously reduces the parameters of high-temperature and high-pressure steam from the bypass to the acceptable range of a condenser, well realizes the temperature and pressure reduction function, and ensures that the turbine unit can stably operate when being started and subjected to load shedding.
Drawings
FIG. 1 is a front view of an annular multi-stage attemperation pressure relief device mated with a turbine bypass system;
FIG. 2 is a side view of an annular multi-stage attemperation pressure relief device mated with a turbine bypass system;
FIG. 3 is a top view of an annular multi-stage attemperation pressure relief device mated with a turbine bypass system.
[ reference numerals description ]
1: a cylinder; 2: a steam diffuser; 3: a support rod; 4: a secondary expansion diffuser; 5: a third stage expansion diffuser; 6: a four stage expansion diffuser; 7: five-stage expansion diffuser pipe; 8: a six-stage expansion diffuser; 9: seven stages of expansion diffuser pipes; 10: eight stages of expansion diffuser pipes; 11: a water inlet for cooling water; 12: a support plate; 13: a temperature-reducing water inlet flange; 14: lifting lugs; 15: steam diffuser inlet flange.
Detailed Description
The invention will be better explained by the following detailed description of the embodiments with reference to the drawings.
The invention discloses an annular multistage temperature and pressure reducing device matched with a turbine bypass system, which is shown in figure 1 and comprises a cylinder body 1, a pressure reducing mechanism and a temperature reducing mechanism,
the pressure reducing mechanism comprises a steam diffusion pipe 2, an expansion diffusion pipe and a supporting rod 3, wherein the supporting rod 3 is vertically fixed in the cylinder body 1, the steam diffusion pipe 2 transversely penetrates through the supporting rod 3 to be fixed in the cylinder body 1, two sides of the steam diffusion pipe 2, which are bounded by the supporting rod 3, are provided with a two-stage expansion diffusion pipe 4, a three-stage expansion diffusion pipe 5, a four-stage expansion diffusion pipe 6, a five-stage expansion diffusion pipe 7, a six-stage expansion diffusion pipe 8, a seven-stage expansion diffusion pipe 9 and an eight-stage expansion diffusion pipe 10, and the expansion diffusion pipes are annular plates with semicircular structures. The steam diffuser pipe 2 is provided with a hole on the half side of the inner part of the cylinder body 1, and high-temperature and high-pressure steam from the bypass system is sprayed out through the hole to be depressurized and enters the secondary expansion diffuser pipe 4. The radius of the secondary expansion diffusion pipe 4 is larger than that of the steam diffusion pipe 2, the secondary expansion diffusion pipe 4 is fixed on one side of the support rod 3, which is provided with holes with the steam diffusion pipe 2, then the expansion diffusion pipes at all stages are sequentially fixed on the support rod 3 in an alternating arrangement mode, which is provided with one side, which is not provided with holes with the steam diffusion pipe 2, the radius of the secondary expansion diffusion pipe 4 is larger than that of the primary expansion diffusion pipe 4, the annular plate is not provided with holes, a gap is reserved at the joint of the support rod 3 and the end part of the expansion diffusion pipe, the steam ejected by the steam diffusion pipe 2 and subjected to the first-stage diffusion expansion enters into an annular area surrounded by the secondary expansion diffusion pipe 4, the support rod 3 and the steam diffusion pipe 2 for second-stage diffusion expansion, the steam subjected to the second-stage diffusion expansion enters into an annular area surrounded by the tertiary expansion diffusion pipe 5, the support rod 3 and the steam diffusion pipe 2, the steam expanded through the third stage diffusion enters into the annular area surrounded by the four-stage expansion diffusion pipe 6, the support rod 3 and the two-stage expansion diffusion pipe 4 to carry out fourth stage diffusion expansion, the steam expanded through the fourth stage diffusion enters into the annular area surrounded by the five-stage expansion diffusion pipe 7, the support rod 3 and the three-stage expansion diffusion pipe 5 to carry out fifth stage diffusion expansion, the steam expanded through the fifth stage diffusion enters into the annular area surrounded by the six-stage expansion diffusion pipe 8, the support rod 3 and the four-stage expansion diffusion pipe 6 to carry out sixth stage diffusion expansion, the steam expanded through the sixth stage diffusion enters into the annular area surrounded by the seven-stage expansion diffusion pipe 9, the support rod 3, the five-stage expansion diffusion pipe 7 to carry out seventh stage diffusion expansion, and the steam expanded through the seventh stage diffusion enters into the eight-stage expansion diffusion pipe 10 and the support rod 3, the eighth stage of diffusion expansion is performed in the annular region surrounded by the sixth stage of expansion diffuser pipe 8. The opening radius of the steam diffusion pipe 2, the radius of each stage of expansion diffusion pipe and the size of the gap between the support rod 3 and the end part of the expansion diffusion pipe are obtained through calculation, so that the steam is ensured to pass through according to the critical pressure ratio.
Optionally, the decompression mechanism further comprises a support plate 12 transversely fixed in the cylinder 1 for fixing the expansion diffuser pipe.
Optionally, the inlet of the steam diffuser pipe 2 is connected to an external pipe via a steam diffuser pipe inlet flange 15.
The temperature reducing mechanism comprises two temperature reducing water inlets 11 which are respectively arranged at the upper part and the lower part of the cylinder body 1 at one side of the air outlet of the expansion diffuser pipe 4 at the last stage. The temperature-reducing water inlet 11 is connected with an external pipeline through a temperature-reducing water inlet flange 13, and a certain number of small holes are formed in the water spraying pipeline to ensure that condensed water is sprayed out in a spraying state through the small holes. The water injection amount of the desuperheating water inlet 11 is calculated. Condensate water with certain pressure sprays steam which is expanded through eighth stage diffusion through a temperature reducing mechanism, so that the cooling effect is achieved, the cooled steam is expanded through ninth stage diffusion, and finally the cooled steam enters the condenser.
Optionally, two lifting lugs 14 are mounted on each of the upper and lower portions of the cylinder 1 for lifting and mounting of the device.
Optionally, the annular multistage temperature and pressure reducing device is integrally welded at the throat part of the condenser.
After the condensed water at the water inlet 11 of the temperature reduction water is taken to a condensed water pump, the calculated pressure is higher, and the condensed water is filtered and then sprayed into the annular multistage temperature reduction and pressure reduction device in a mist form through a water spray regulating valve of the temperature reduction mechanism so as to prevent the spray hole from being blocked.
When the bypass system is thrown in, the temperature reduction water spray must be thrown in at the same time, otherwise, the temperature of steam entering the condenser exceeds an allowable value, and damage is caused to the annular multistage temperature reduction and pressure reduction device and the condenser. The water spraying control valve in the temperature reducing mechanism of the annular multistage temperature and pressure reducing device is interlocked with the action signal of the bypass valve, and when the bypass valve acts, the water spraying control valve correspondingly acts and sprays cooling water.
The temperature and pressure reducing device adopts nine-stage pressure reducing and one-stage temperature reducing of an annular structure, wherein the one-stage temperature reducing is arranged after the eighth-stage pressure reducing, and the last-stage critical diffusion expansion is adopted before the condenser. According to the unit bypass steam parameters, the opening radius of the steam diffuser pipe 2, the radius of each stage of expansion diffuser pipe, the size of a gap at the joint of the support rod 3 and the end part of the expansion diffuser pipe and the water spraying quantity of the temperature reducing water inlet 11 are calculated. Because the pressure and the temperature of the steam at the inlet of the steam diffuser pipe 2 are relatively high, the pipe diameter is generally smaller, so that the design of each stage is more convenient. The steam in each subsequent stage is designed according to the critical pressure ratio, the specific volume of the steam is increased along with the pressure reduction, the volume of the steam in each stage is greatly increased compared with that in the previous stage, the diffusion radius is greatly increased structurally, and the required pipe diameter is also increased. The structure is simple in structure, the function of independent operation without adding a power supply is achieved, meanwhile, the steam parameters from the bypass are reduced to the range acceptable by the condenser, the functions of temperature reduction and pressure reduction are achieved well, and the unit can stably operate when the unit is started and is subjected to load shedding.
The technical principles of the present invention have been described above in connection with specific embodiments, which are provided for the purpose of explaining the principles of the present invention and are not to be construed as limiting the scope of the present invention in any way. Other embodiments of the invention will be apparent to those skilled in the art from consideration of this specification without undue burden.
Claims (7)
1. An annular multistage temperature and pressure reducing device matched with a turbine bypass system comprises a cylinder body (1), a pressure reducing mechanism and a temperature reducing mechanism, and is characterized in that,
the pressure reducing mechanism comprises a steam diffusion pipe (2), an expansion diffusion pipe and a supporting rod (3), and the supporting rod (3) is vertically fixed in the cylinder body (1);
the steam diffusion pipe (2) transversely penetrates through the supporting rod (3) and is fixed in the cylinder body (1), and a part of the steam diffusion pipe (2) in the cylinder body (1) is provided with a half side hole;
the expansion diffusion pipes are annular plates with semicircular structures, the two sides of the steam diffusion pipe (2) taking the supporting rods (3) as the boundary are provided with multi-stage expansion diffusion pipes, the radius of each secondary expansion diffusion pipe (4) is larger than that of the steam diffusion pipe (2), the secondary expansion diffusion pipes are fixed on one side of the supporting rods (3) which is provided with holes with the steam diffusion pipe (2), then each stage of expansion diffusion pipes are sequentially fixed on the supporting rods (3) in an alternating arrangement mode of one side of the corresponding support rod which is not provided with the corresponding steam diffusion pipe (2) and one side of the corresponding support rod which is provided with the corresponding steam diffusion pipe (2), the radius of each secondary expansion diffusion pipe is larger than that of each previous expansion diffusion pipe, and a gap is reserved at the connection part of the end part of each supporting rod (3) and each expansion diffusion pipe;
the temperature reducing mechanism comprises two temperature reducing water inlets (11) which are respectively arranged at the upper part and the lower part of the cylinder body (1) at one side of the air outlet of the expansion diffusion pipe at the last stage;
the water inlet (11) of the temperature reducing water inlet is connected with an external pipeline through a flange (13) of the temperature reducing water inlet, and a certain number of small holes are formed in the water spraying pipeline to ensure that condensed water is sprayed out in a spraying state through the small holes;
and the condensed water with certain pressure sprays the steam which is subjected to diffusion expansion of the eighth stage through the temperature reducing mechanism, and the cooled steam is subjected to diffusion expansion of the ninth stage and finally enters the condenser.
2. The annular multistage temperature and pressure reducing device matched with the bypass system of the steam turbine according to claim 1, wherein the annular multistage temperature and pressure reducing device comprises a plurality of annular multistage temperature and pressure reducing devices,
the decompression mechanism also comprises a supporting plate (12) which is transversely fixed in the cylinder body (1) and is used for fixing the expansion diffuser pipe.
3. The annular multistage temperature and pressure reducing device matched with the bypass system of the steam turbine according to claim 2, wherein the annular multistage temperature and pressure reducing device comprises a plurality of annular multistage temperature and pressure reducing devices,
the opening radius of the steam diffuser pipe (2), the radius of each stage of expansion diffuser pipe, the gap size at the joint of the support rod (3) and the end part of the expansion diffuser pipe and the water spraying quantity of the temperature reducing water inlet (11) are all obtained through calculation.
4. A turbine bypass system associated annular multi-stage attemperation and depressurization device as set forth in claim 3 wherein,
two lifting lugs (14) are respectively arranged at the upper part and the lower part of the cylinder body (1) for lifting and installing the device.
5. The annular multistage temperature and pressure reducing device matched with the bypass system of the steam turbine according to claim 4,
the inlet of the steam diffusion pipe (2) is connected with an external pipeline through a steam diffusion pipe inlet flange (15).
6. The annular multistage temperature and pressure reducing device matched with the bypass system of the steam turbine according to claim 5,
the expansion diffuser pipe comprises a secondary expansion diffuser pipe (4), a tertiary expansion diffuser pipe (5), a quaternary expansion diffuser pipe (6), a penta-stage expansion diffuser pipe (7), a hexa-stage expansion diffuser pipe (8), a hepta-stage expansion diffuser pipe (9) and an octa-stage expansion diffuser pipe (10).
7. The annular multistage temperature and pressure reducing device matched with the bypass system of the steam turbine according to claim 6,
the annular multistage temperature and pressure reduction device is integrally welded at the throat part of the condenser.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910365402.4A CN110043335B (en) | 2019-04-30 | 2019-04-30 | Annular multistage temperature and pressure reducing device matched with turbine bypass system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910365402.4A CN110043335B (en) | 2019-04-30 | 2019-04-30 | Annular multistage temperature and pressure reducing device matched with turbine bypass system |
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| CN110043335A CN110043335A (en) | 2019-07-23 |
| CN110043335B true CN110043335B (en) | 2023-09-01 |
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| CN201910365402.4A Active CN110043335B (en) | 2019-04-30 | 2019-04-30 | Annular multistage temperature and pressure reducing device matched with turbine bypass system |
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Citations (13)
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|---|---|---|---|---|
| CH362093A (en) * | 1958-11-11 | 1962-05-31 | Escher Wyss Ag | Steam turbine with bypass expansion device |
| CN1050082A (en) * | 1989-08-24 | 1991-03-20 | 基斯通国际集团公司 | The decompression and the modulating valve that have improved |
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| DE69501372D1 (en) * | 1994-08-03 | 1998-02-12 | Rolls Royce Plc | A gas turbine engine and a diffuser for it |
| DE19909634A1 (en) * | 1999-03-05 | 2000-09-07 | Willschuetz Klaus Dieter | Pipeline repair aid device |
| CN2636182Y (en) * | 2003-08-04 | 2004-08-25 | 傅皓 | Vortex injection temp. reducing device |
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| CN2658570Y (en) * | 2003-07-23 | 2004-11-24 | 上海动力设备有限公司 | Shell type bypass steam temp. pressure reducing device |
| CN201540039U (en) * | 2009-06-10 | 2010-08-04 | 章礼道 | Condenser enabling DC furnace start-up drainage and low-voltage bypass to share energy dissipating device |
| CN103244749A (en) * | 2013-06-06 | 2013-08-14 | 兰州理工大学 | Pressure reducing valve |
| CN109139138A (en) * | 2017-06-16 | 2019-01-04 | 湖北三宁化工股份有限公司 | A kind of novel Desuperheating device of steam converter valve |
| CN109441575A (en) * | 2018-09-30 | 2019-03-08 | 国网天津市电力公司电力科学研究院 | The method of steam combined cycle power generating unit heat supply period heat network system operation |
| CN209818123U (en) * | 2019-04-30 | 2019-12-20 | 北京龙威发电技术有限公司 | Annular multistage temperature and pressure reduction device matched with steam turbine bypass system |
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2019
- 2019-04-30 CN CN201910365402.4A patent/CN110043335B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH362093A (en) * | 1958-11-11 | 1962-05-31 | Escher Wyss Ag | Steam turbine with bypass expansion device |
| CN1050082A (en) * | 1989-08-24 | 1991-03-20 | 基斯通国际集团公司 | The decompression and the modulating valve that have improved |
| WO1995025880A1 (en) * | 1994-03-22 | 1995-09-28 | Siemens Aktiengesellschaft | Process for operating a waste heat steam generator and waste heat steam generator so operated |
| DE69501372D1 (en) * | 1994-08-03 | 1998-02-12 | Rolls Royce Plc | A gas turbine engine and a diffuser for it |
| DE19909634A1 (en) * | 1999-03-05 | 2000-09-07 | Willschuetz Klaus Dieter | Pipeline repair aid device |
| CN2656768Y (en) * | 2003-07-09 | 2004-11-17 | 晏泽荣 | High pressure difference regulating valve |
| CN2658570Y (en) * | 2003-07-23 | 2004-11-24 | 上海动力设备有限公司 | Shell type bypass steam temp. pressure reducing device |
| CN2636182Y (en) * | 2003-08-04 | 2004-08-25 | 傅皓 | Vortex injection temp. reducing device |
| CN201540039U (en) * | 2009-06-10 | 2010-08-04 | 章礼道 | Condenser enabling DC furnace start-up drainage and low-voltage bypass to share energy dissipating device |
| CN103244749A (en) * | 2013-06-06 | 2013-08-14 | 兰州理工大学 | Pressure reducing valve |
| CN109139138A (en) * | 2017-06-16 | 2019-01-04 | 湖北三宁化工股份有限公司 | A kind of novel Desuperheating device of steam converter valve |
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| CN110043335A (en) | 2019-07-23 |
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