CN210442061U - High-pressure stop device for hydrostatic test of coiled tube heat exchange module - Google Patents
High-pressure stop device for hydrostatic test of coiled tube heat exchange module Download PDFInfo
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- CN210442061U CN210442061U CN201921346555.6U CN201921346555U CN210442061U CN 210442061 U CN210442061 U CN 210442061U CN 201921346555 U CN201921346555 U CN 201921346555U CN 210442061 U CN210442061 U CN 210442061U
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Abstract
The utility model discloses a high-pressure cut-off device for a hydrostatic test of a coiled tube heat exchange module, which comprises a connecting tube and a sleeve, wherein a connecting tube flange plate is arranged at the water outlet end of the connecting tube, a sleeve flange plate is arranged at the water inlet end of the sleeve, a spring positioning table is arranged at the center of the sleeve flange plate, and the spring positioning table is connected with the sleeve flange plate into a whole through a plurality of radial rods circumferentially arranged outside the spring positioning table; the connecting pipe is characterized in that a supporting pipe used for communicating the sleeve pipe with the connecting pipe is arranged between the sleeve pipe flange disc and the connecting pipe flange disc, the sleeve pipe, the supporting pipe and the connecting pipe are connected and fixed together through a fastening assembly, a stop door is arranged between the spring positioning table and the water outlet end of the connecting pipe, a spring is connected between the stop door and the spring positioning table, and the spring enables the stop door to have the trend of being tightly pressed at the water outlet end of the connecting pipe all the time. The utility model has the advantages of can improve work efficiency.
Description
Technical Field
The utility model relates to an energy saving and emission reduction heat transfer device's hydrostatic test equipment technical field, concretely relates to coiled pipe heat transfer module hydrostatic test is with high pressure ending device.
Background
Energy is used as a material basis for survival and development of human society, is highly valued by all countries in the world, and is not exceptional in China, and particularly in the current new historical development period, energy conservation and emission reduction are inevitable choices for establishing a resource-saving and environment-friendly society for accelerating the pace of ecological civilization construction in China. Energy conservation and emission reduction are long-term strategic guidelines for economic and social development in China and are extremely urgent tasks. The waste heat recovery and energy consumption reduction have important practical significance for realizing energy conservation, emission reduction and environmental protection development strategy in China. Meanwhile, the utilization of waste heat plays an increasingly important role in the aspects of improving labor conditions, saving energy, increasing production, improving product quality, reducing production cost and the like, and some of the waste heat become an integral part in industrial production.
The boiler exhaust heat loss of the power station is one of the main heat losses in the thermal power plant, and the exhaust waste heat utilization system is adopted to reduce the exhaust temperature, so that the economy of the power plant can be greatly improved, and the boiler exhaust heat loss is one of the important ways for improving the heat efficiency of a unit.
At present, a plurality of domestic power plants adopt a low-temperature economizer technology to reduce the exhaust gas temperature and improve the economy of the power plants. The heat exchange device assembled by a plurality of coiled pipe heat exchange modules is one of necessary devices of the low-temperature economizer technology, and the advantages and disadvantages of the performance of the coiled pipe heat exchange modules directly influence the electric dust removal efficiency and the effective service life of system equipment. The serpentine heat exchange module used at present generally comprises: the heat exchanger comprises two headers and a plurality of rows of snakelike heat exchange tubes positioned between the two headers, wherein one header is provided with a water inlet pipe and a water outlet pipe, and the other header is provided with an exhaust pipe and a water inlet pipe and a water outlet pipe.
The hydrostatic test is one of the most important processes in the manufacturing process of the coiled tube heat exchange module and is used for detecting whether the coiled tube heat exchange module has leakage, can bear pressure after operation, and has obvious defects of welding penetration, welding leakage, cracks and the like of welding seams.
During a hydraulic pressure test, firstly connecting an exhaust pipe of a header with a pressurizing device, connecting a water inlet pipe of one header with a high-pressure water pump through a water source connecting pipe with a check valve, then opening the check valve and starting the high-pressure water pump, injecting a high-pressure water source into each header and each serpentine heat exchange pipe of a serpentine heat exchange module through the water source connecting pipe by the high-pressure water pump, after the serpentine heat exchange module is filled with water, closing the check valve and closing the high-pressure water pump, sealing and plugging a water inlet pipe and a water outlet pipe of the other header through a seal head, then pulling out the water source connecting pipe from the header and sealing and plugging the water inlet pipe and the water outlet pipe of the header through the seal head, then pressurizing the inside of the serpentine heat exchange module by the pressurizing device, and checking whether the serpentine heat exchange module leaks.
Because in the hydrostatic test process, this kind of with the water source connecting pipe from the business turn over water pipe of collection case back again installation head to this business turn over water pipe carry out the sealed work mode of shutoff, not only waste time and energy, the operation is inconvenient, influences work efficiency moreover.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a coiled pipe heat transfer module hydrostatic test that labour saving and time saving just can improve work efficiency is with high pressure ending device.
In order to achieve the above purpose, the utility model adopts the following technical scheme: the high-pressure cut-off device for the hydrostatic test of the coiled tube heat exchange module comprises a connecting pipe connected with a water source connecting pipe and a sleeve connected with a water inlet pipe and a water outlet pipe of a header of the coiled tube heat exchange module, wherein one pipe end of two side pipe ends of the connecting pipe connected with the water source connecting pipe is a water inlet end, the other pipe end of the two side pipe ends of the connecting pipe is a water outlet end, a pipe connecting flange plate is arranged at the water outlet end of the connecting pipe, one pipe end of the two side pipe ends of the sleeve connected with the water inlet pipe and the water outlet pipe is a water outlet end, the other pipe end of the other side pipe end of the sleeve is a water inlet end, a sleeve flange plate is arranged at the water inlet end of the sleeve, a spring positioning table is arranged at the center; a supporting pipe used for communicating the sleeve with the connecting pipe is arranged between the sleeve flange disc and the connecting pipe flange disc, the connecting pipe, the supporting pipe and the sleeve jointly form a water passage, the connecting pipe, the supporting pipe and the sleeve are connected and fixed together through a fastening assembly, a check door is arranged between the spring positioning table and the water outlet end of the connecting pipe, a spring is connected between the check door and the spring positioning table, and the spring enables the check door to always have the tendency of being tightly pressed on the end face of the water outlet end of the connecting pipe; when the water pressure of the pipe connecting side is greater than the sum of the acting force of the spring and the water pressure of the sleeve pipe side, the stop gate can leave the end face of the water outlet end of the pipe connecting under the action of the water pressure of the pipe connecting side, so that the water passing channel is opened, and when the water pressure of the sleeve pipe side is greater than the water pressure of the pipe connecting side, the stop gate can be tightly pressed on the end face of the water outlet end of the pipe connecting under the combined action of the water pressure of the sleeve pipe side and the spring, so that.
Further, aforementioned coiled pipe heat transfer module is high pressure device of ending for hydrostatic test, wherein: the structure of the fastening assembly includes: the pipe connecting flange plate is provided with a plurality of first through holes which axially penetrate through the pipe connecting flange plate along the circumferential direction, the pipe connecting flange plate is provided with a plurality of second through holes which axially penetrate through the pipe connecting flange plate along the circumferential direction, the first through holes of the pipe connecting flange plate and the second through holes of the pipe connecting flange plate are in one-to-one correspondence, each pair of corresponding first through holes and second through holes are respectively provided with a fastening bolt in a penetrating way, a screw rod of each fastening bolt penetrates through the corresponding first through holes and second through holes and then is respectively connected with a fastening nut in a threaded way, all the fastening nuts are screwed, the pipe connecting flange plate and the pipe connecting flange plate are in a relative sealing and clamping supporting pipe, and therefore the sleeve pipe, the supporting pipe and the connecting pipe can be detachably connected and.
Further, aforementioned coiled pipe heat transfer module is high pressure device of ending for hydrostatic test, wherein: the end faces of the opposite sides of the sleeve flange plate and the pipe connecting flange plate are respectively provided with annular positioning grooves for embedding the supporting pipe, pipe ends on two sides of the supporting pipe are respectively embedded into the corresponding annular positioning grooves on two sides, and a sealing gasket for sealing a gap between the flange plate and the supporting pipe is respectively placed in each annular positioning groove.
Further, aforementioned coiled pipe heat transfer module is high pressure device of ending for hydrostatic test, wherein: and when the check door is tightly pressed on the end face of the water outlet end of the connecting pipe through the sealing washer, the sealing washer can seal a gap between the check door and the end face of the water outlet end of the connecting pipe.
Further, aforementioned coiled pipe heat transfer module is high pressure device of ending for hydrostatic test, wherein: each spoke rod is provided with a guide pipe which axially extends to the flange of the connecting pipe, all the guide pipes surround the outer side of the stop gate, and all the guide pipes form a guide channel which can ensure that the stop gate accurately moves to the end face of the water outlet end of the connecting pipe.
Further, aforementioned coiled pipe heat transfer module is high pressure device of ending for hydrostatic test, wherein: the center of the spring positioning table is provided with a first positioning boss which protrudes towards the connecting pipe side and is used for the spring to be sleeved in, the center of the stop door is provided with a second positioning boss which protrudes towards the sleeve side and is used for the spring to be sleeved in, and two ends of the spring are respectively sleeved on the first positioning boss and the second positioning boss.
Through the implementation of the above technical scheme, the beneficial effects of the utility model are that: the structure is simple, the disassembly and the maintenance are convenient, when the high-pressure water pump continuously injects high-pressure water into the connecting pipe through the water source connecting pipe, because the water pressure at the side of the connecting pipe is larger than the sum of the acting force of the spring and the water pressure at the side of the sleeve, the stop door can leave the end surface of the water outlet end of the connecting pipe under the action of the water pressure at the side of the connecting pipe to open the water passage, so that the high-pressure water can continuously and automatically fill the coiled pipe heat exchange module; when the high-pressure water pump and the check valve are turned off, the check valve compresses the water outlet end face of the connecting pipe to cut off the water passing channel under the combined action of the water pressure at the side of the sleeve and the spring along with the pressurization of the coiled pipe heat exchange module by the pressurization device, and the water pressure in the coiled pipe heat exchange module is greater than the water pressure at the side of the connecting pipe, so that the water passing channel is automatically sealed and blocked.
Drawings
Figure 1 is coiled pipe heat transfer module hydrostatic test with high pressure ending to lead to device's structure schematic power.
Fig. 2 is a schematic view of the construction of the sleeve flange shown in the right-hand direction of fig. 1.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1 and 2, the high-pressure cut-off device for the hydrostatic test of the coiled tube heat exchange module comprises a connecting tube 1 connected with a water source connecting tube and a sleeve 2 connected with a water inlet and outlet tube of a header of the coiled tube heat exchange module, wherein one tube end of two side tube ends of the connecting tube 1 connected with the water source connecting tube is a water inlet end, the other tube end of the two side tube ends of the connecting tube 1 is a water outlet end, a connecting tube flange 3 is arranged at the water outlet end of the connecting tube 1, one tube end of the two side tube ends of the sleeve 2 connected with the water inlet and outlet tube is a water outlet end, the other tube end of the two side tube ends of the sleeve 2 is a water inlet end, a sleeve flange 4 is arranged at the water inlet end of the sleeve 2, a spring positioning table 5 is arranged at the center of the sleeve flange 4, and the spring positioning table 5 is; a supporting pipe 7 used for communicating the sleeve 2 with the connecting pipe 1 is arranged between the sleeve flange plate 4 and the connecting pipe flange plate 3, the sleeve 2, the supporting pipe 7 and the connecting pipe 1 are connected and fixed together through a fastening assembly, a stop gate 8 is arranged between the spring positioning table 5 and the water outlet end of the connecting pipe 1, a spring 9 is connected between the stop gate 8 and the spring positioning table 5, and the stop gate 8 always has the tendency of being tightly pressed on the end face of the water outlet end of the connecting pipe 1 by the spring 9; when the water pressure at the pipe connecting side is greater than the sum of the acting force of the spring and the water pressure at the sleeve pipe side, the stop gate 8 can leave the water outlet end of the pipe connecting 1 under the action of the water pressure at the pipe connecting side to open the pipe connecting 1, so that the pipe connecting 1, the support pipe 7 and the sleeve pipe 2 are communicated to form a water passing channel, and when the water pressure at the sleeve pipe side is greater than the water pressure at the pipe connecting side, the stop gate 8 can be pressed on the end surface of the water outlet end of the pipe connecting 1 under the combined action of the water pressure at the sleeve pipe side and the spring 9 to close the pipe connecting;
in this embodiment, the structure of the fastening assembly includes: a plurality of first through holes 31 axially penetrating through the pipe flange plate 3 are circumferentially arranged on the pipe flange plate 3, a plurality of second through holes 41 axially penetrating through the pipe flange plate 4 are circumferentially arranged on the sleeve flange plate 4, the first through holes 31 of the pipe flange plate 3 correspond to the second through holes 41 of the sleeve flange plate 4 one by one, a fastening bolt 10 is respectively penetrated in each pair of the corresponding first through holes 31 and the corresponding second through holes 41, a screw rod of each fastening bolt 10 penetrates through the corresponding first through holes 31 and the corresponding second through holes 41 and then is respectively in threaded connection with a fastening nut 11, all the fastening nuts 11 are screwed, so that the pipe flange plate 3 and the sleeve flange plate 4 are oppositely sealed and clamped with the supporting pipe 7, and the sleeve 2, the supporting pipe 7 and the pipe 1 are detachably connected and fixed together, the fastening assembly has a simple structure, and can facilitate the dismounting and maintenance of the sleeve 2, the supporting pipe 7 and the pipe 1, the assembly and maintenance efficiency is improved;
in the embodiment, annular positioning grooves for embedding the supporting pipes are respectively arranged on the end faces of the opposite sides of the sleeve flange plate 4 and the pipe connecting flange plate 3, the pipe ends of the two sides of the supporting pipes 7 are respectively embedded into the corresponding annular positioning grooves on the two sides, and a first sealing gasket 12 for sealing a gap between the flange plate and the supporting pipe 7 is respectively arranged in each annular positioning groove, so that the sealing effects of the sleeve 2, the supporting pipe 7 and the pipe connecting 1 can be improved, and the use stability of the equipment is improved; in the embodiment, the second sealing washer 13 is arranged between the stop door 8 and the water outlet end face of the connecting pipe 1, and when the stop door 8 is pressed on the water outlet end face of the connecting pipe 1 through the second sealing washer 13, the second sealing washer 13 seals a gap between the stop door 8 and the water outlet end face of the connecting pipe 1, so that the sealing effect between the stop door and the water outlet end face of the connecting pipe can be improved, and the use stability of the equipment is further improved;
in the embodiment, each spoke rod 6 is respectively provided with a guide pipe 14 which axially extends to the pipe connecting flange plate 4, all the guide pipes 14 surround the outside of the stop gate 8, and all the guide pipes 14 form a guide channel which can ensure that the stop gate 8 accurately moves to the end surface of the water outlet end of the connecting pipe 1, so that the use stability of the equipment can be further improved; in the embodiment, the center of the spring positioning table 5 is provided with a first positioning boss 51 which is protruded towards the pipe connecting side and is used for being sleeved with the spring 9, the center of the stop door 8 is provided with a second positioning boss 81 which is protruded towards the pipe connecting side and is used for being sleeved with the spring 9, and two ends of the spring 9 are respectively sleeved on the first positioning boss 51 and the second positioning boss 81, so that the stop door and the spring are installed together in a split mode, and the spring and the stop door are more convenient to assemble, disassemble and maintain;
during a hydraulic pressure test, a sleeve 2 of the high-pressure check device is connected with a water inlet and outlet pipe of one header of the coiled pipe heat exchange module, then a connecting pipe 1 of the high-pressure check device is connected with a water source connecting pipe connected with a high-pressure water pump, then the check valve is opened and the high-pressure water pump is started, at the moment, the high-pressure water pump continuously injects high-pressure water into the connecting pipe 1 through the water source connecting pipe, as the water pressure at the connecting pipe side is larger than the sum of the spring acting force and the water pressure at the sleeve side, at the moment, the check valve 8 can leave the water outlet end of the connecting pipe 1 under the action of the water pressure at the connecting pipe side to open a water passage, and at the moment; after the coiled pipe heat exchange module is filled with water, the stop valve is closed and the high-pressure water pump is stopped, then the water inlet and outlet pipe of the other header is sealed and blocked through the end socket, then the pressure device is used for pressurizing the inside of the coiled pipe heat exchange module, when the water pressure in the coiled pipe heat exchange module is greater than the water pressure on the pipe connecting side, namely the water pressure on the sleeve pipe side is greater than the water pressure on the pipe connecting side, the stop valve 8 can be tightly pressed on the end face of the water outlet end of the pipe connecting 1 under the combined action of the water pressure on the sleeve pipe side and the spring 9, so that a water passage is cut off, the sealed and blocked of the water inlet and outlet pipe are automatically completed, the pressure device stops pressurizing after the pressure in the coiled pipe heat exchange module is increased to a preset detection pressure, and whether.
The utility model has the advantages that: the utility model has the advantages that: the structure is simple, the disassembly and the maintenance are convenient, when the high-pressure water pump continuously injects high-pressure water into the connecting pipe through the water source connecting pipe, because the water pressure at the side of the connecting pipe is larger than the sum of the acting force of the spring and the water pressure at the side of the sleeve, the stop door can leave the end surface of the water outlet end of the connecting pipe under the action of the water pressure at the side of the connecting pipe to open the water passage, so that the high-pressure water can continuously and automatically fill the coiled pipe heat exchange module; when the high-pressure water pump and the check valve are turned off, the check valve compresses the water outlet end face of the connecting pipe to cut off the water passing channel under the combined action of the water pressure at the side of the sleeve and the spring along with the pressurization of the coiled pipe heat exchange module by the pressurization device, and the water pressure in the coiled pipe heat exchange module is greater than the water pressure at the side of the connecting pipe, so that the water passing channel is automatically sealed and blocked.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any modifications or equivalent changes made in accordance with the technical spirit of the present invention are also within the scope of the present invention.
Claims (7)
1. Coil pipe heat transfer module hydrostatic test is with high pressure device that leads to that its characterized in that: the pipe joint comprises a connecting pipe connected with a water source connecting pipe and a sleeve connected with a water inlet pipe and a water outlet pipe of a header of a coiled pipe heat exchange module, wherein one side pipe end connected with the water source connecting pipe in the pipe ends at two sides of the connecting pipe is a water inlet end, the other side pipe end is a water outlet end, a pipe connecting flange plate is arranged at the water outlet end of the connecting pipe, one side pipe end connected with the water inlet pipe and the water outlet pipe in the pipe ends at two sides of the sleeve is a water outlet end, the other side pipe end is a water inlet end, a sleeve flange plate is arranged at the water inlet end of the sleeve, a spring positioning table is arranged at the center of the sleeve flange plate, and the spring positioning table is connected with the; a supporting pipe used for communicating the sleeve with the connecting pipe is arranged between the sleeve flange disc and the connecting pipe flange disc, the connecting pipe, the supporting pipe and the sleeve jointly form a water passage, the connecting pipe, the supporting pipe and the sleeve are connected and fixed together through a fastening assembly, a check door is arranged between the spring positioning table and the water outlet end of the connecting pipe, a spring is connected between the check door and the spring positioning table, and the spring enables the check door to always have the tendency of being tightly pressed on the end face of the water outlet end of the connecting pipe; when the water pressure of the pipe connecting side is greater than the sum of the acting force of the spring and the water pressure of the sleeve pipe side, the stop gate can leave the end face of the water outlet end of the pipe connecting under the action of the water pressure of the pipe connecting side, so that the water passing channel is opened, and when the water pressure of the sleeve pipe side is greater than the water pressure of the pipe connecting side, the stop gate can be tightly pressed on the end face of the water outlet end of the pipe connecting under the combined action of the water pressure of the sleeve pipe side and the spring, so that.
2. The high-pressure stop device for the hydraulic test of the coiled heat exchange module as claimed in claim 1, wherein: the structure of the fastening assembly includes: the pipe connecting flange plate is provided with a plurality of first through holes which axially penetrate through the pipe connecting flange plate along the circumferential direction, the pipe connecting flange plate is provided with a plurality of second through holes which axially penetrate through the pipe connecting flange plate along the circumferential direction, the first through holes of the pipe connecting flange plate and the second through holes of the pipe connecting flange plate are in one-to-one correspondence, each pair of corresponding first through holes and second through holes are respectively provided with a fastening bolt in a penetrating way, a screw rod of each fastening bolt penetrates through the corresponding first through holes and second through holes and then is respectively connected with a fastening nut in a threaded way, all the fastening nuts are screwed, the pipe connecting flange plate and the pipe connecting flange plate are in a relative sealing and clamping supporting pipe, and therefore the sleeve pipe, the supporting pipe and the connecting pipe can be detachably connected and.
3. The high-pressure stop device for the hydraulic test of the coiled heat exchange module as claimed in claim 1, wherein: the end faces of the opposite sides of the sleeve flange plate and the pipe connecting flange plate are respectively provided with annular positioning grooves for embedding the supporting pipe, pipe ends on two sides of the supporting pipe are respectively embedded into the corresponding annular positioning grooves on two sides, and a sealing gasket for sealing a gap between the flange plate and the supporting pipe is respectively placed in each annular positioning groove.
4. The high-pressure stop device for the hydraulic test of the coiled heat exchange module as claimed in claim 1, wherein: and when the check door is tightly pressed on the end face of the water outlet end of the connecting pipe through the sealing washer, the sealing washer can seal a gap between the check door and the end face of the water outlet end of the connecting pipe.
5. The high-pressure stop device for the hydraulic test of the coiled heat exchange module according to claim 1, 2, 3 or 4, wherein: each spoke rod is provided with a guide pipe which axially extends to the flange of the connecting pipe, all the guide pipes surround the outer side of the stop gate, and all the guide pipes form a guide channel which can ensure that the stop gate accurately moves to the end face of the water outlet end of the connecting pipe.
6. The high-pressure stop device for the hydraulic test of the coiled heat exchange module according to claim 1, 2, 3 or 4, wherein: the center of the spring positioning table is provided with a first positioning boss which protrudes towards the connecting pipe side and is used for the spring to be sleeved in, the center of the stop door is provided with a second positioning boss which protrudes towards the sleeve side and is used for the spring to be sleeved in, and two ends of the spring are respectively sleeved on the first positioning boss and the second positioning boss.
7. The high-pressure stop device for the hydraulic test of the coiled heat exchange module as claimed in claim 5, wherein: the center of the spring positioning table is provided with a first positioning boss which protrudes towards the connecting pipe side and is used for the spring to be sleeved in, the center of the stop door is provided with a second positioning boss which protrudes towards the sleeve side and is used for the spring to be sleeved in, and two ends of the spring are respectively sleeved on the first positioning boss and the second positioning boss.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921346555.6U CN210442061U (en) | 2019-08-19 | 2019-08-19 | High-pressure stop device for hydrostatic test of coiled tube heat exchange module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921346555.6U CN210442061U (en) | 2019-08-19 | 2019-08-19 | High-pressure stop device for hydrostatic test of coiled tube heat exchange module |
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| CN210442061U true CN210442061U (en) | 2020-05-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921346555.6U Active CN210442061U (en) | 2019-08-19 | 2019-08-19 | High-pressure stop device for hydrostatic test of coiled tube heat exchange module |
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| CN (1) | CN210442061U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110426277A (en) * | 2019-08-19 | 2019-11-08 | 江苏龙净节能科技有限公司 | A kind of coiled pipe heat exchange module water pressure test high pressure sealing docking facilities |
-
2019
- 2019-08-19 CN CN201921346555.6U patent/CN210442061U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110426277A (en) * | 2019-08-19 | 2019-11-08 | 江苏龙净节能科技有限公司 | A kind of coiled pipe heat exchange module water pressure test high pressure sealing docking facilities |
| CN110426277B (en) * | 2019-08-19 | 2023-12-05 | 江苏龙净节能科技有限公司 | High-pressure sealing butt joint device for water pressure test of coiled pipe heat exchange module |
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Inventor after: Huang Tingjian Inventor after: Chen Xiaolei Inventor after: Zhong Zhiliang Inventor after: Wu Changsen Inventor after: Peng Wenxi Inventor after: Gu Jianqing Inventor before: Huang Tingjian Inventor before: Chen Xiaolei Inventor before: Zhong Zhiliang Inventor before: Wu Changsen Inventor before: Peng Wenxi Inventor before: Gu Jianqing |