CN109780206B - Simple connecting shaft protection device for small and miniature natural gas pressure energy power generation - Google Patents
Simple connecting shaft protection device for small and miniature natural gas pressure energy power generation Download PDFInfo
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- CN109780206B CN109780206B CN201910037341.9A CN201910037341A CN109780206B CN 109780206 B CN109780206 B CN 109780206B CN 201910037341 A CN201910037341 A CN 201910037341A CN 109780206 B CN109780206 B CN 109780206B
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- sleeve
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 94
- 239000003345 natural gas Substances 0.000 title claims abstract description 47
- 238000010248 power generation Methods 0.000 title claims abstract description 25
- 238000007789 sealing Methods 0.000 claims abstract description 76
- 239000007789 gas Substances 0.000 claims abstract description 30
- 238000010168 coupling process Methods 0.000 claims abstract description 21
- 238000005859 coupling reaction Methods 0.000 claims abstract description 21
- 230000008878 coupling Effects 0.000 claims abstract description 20
- 230000006835 compression Effects 0.000 claims abstract description 13
- 238000007906 compression Methods 0.000 claims abstract description 13
- 239000003063 flame retardant Substances 0.000 claims abstract description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 18
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 10
- 238000012544 monitoring process Methods 0.000 claims description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims description 8
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 4
- 229920006351 engineering plastic Polymers 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 229910052786 argon Inorganic materials 0.000 claims description 2
- 239000001307 helium Substances 0.000 claims description 2
- 229910052734 helium Inorganic materials 0.000 claims description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims 1
- 238000012423 maintenance Methods 0.000 abstract description 5
- 238000005253 cladding Methods 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000011897 real-time detection Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 239000012945 sealing adhesive Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Abstract
The invention discloses a simple connecting shaft protection device for small and miniature natural gas pressure energy power generation, which comprises a hollow coupler protection device, an information display device and a thread compression sealing device; the screw thread compresses tightly sealing device and is in through threaded symmetry coupling protection device's both ends, coupling protection device passes through threaded compressing tightly sealing device seals the shaft coupling that sets up between pneumatic motor and explosion-proof generator relative sealing end face and cladding pneumatic motor and explosion-proof generator, the fire-retardant gas of certain pressure has been injected into in the sealed inner chamber that the sealing end face that shaft coupling protection device, threaded compressing tightly sealing device, pneumatic motor and explosion-proof generator are relative enclosed. The invention has the advantages of no need of external power, simple operation, convenient maintenance, stable work and the like, can judge whether natural gas leaks or not, reduces manual supervision, greatly improves the operation safety of a pipe network, and can be applied to the whole natural gas pipe network pressure energy power generation device in the future.
Description
Technical Field
The invention belongs to the field of safety protection of pressure energy power generation of small-sized natural gas networks, and particularly relates to a simple connecting shaft protection device for pressure energy power generation of small-sized natural gas.
Background
With the rapid development of society, natural gas is used as a clean green energy source to gradually replace other energy sources with larger pollution, and becomes a main supply energy source of cities. This also puts higher demands on the operation management and safety construction of the urban gas network. Along with the rapid development of China economic society, the living standard of people is gradually improved, the gas demand is increased, and the construction of a gas pipe network enters a rapid development period, so that the gas pressure regulating box is spread over the area along the line.
The gas pressure regulating box is characterized in that a pressure regulating device is arranged in a special box body and is arranged near a building, a production area and a living area to bear the regulation task of gas pressure. The general pressure regulating box has the characteristics of compact structure, mature technology, small occupied area and the like, so that the pressure regulating box can be widely applied to a natural gas pipe network gas supply system, and has large quantity and long running time. As urban density increases, the built medium-low voltage regulating box is surrounded by various temporary buildings, and various potential safety risks are multiplied.
Meanwhile, because the cost of replacing the hardware equipment of the gas equipment is higher, the pressure energy power generation device of the small and miniature natural pipe network is gradually popularized for improving the safety monitoring capability of the gas pressure regulating device. In theory, the pressure energy power generation can be performed at the position with the pressure regulating box. However, the technology also has the difficult problem of gas leakage of the dynamic sealing structure. Therefore, a simple connecting shaft protection device is needed, more sufficient safety protection measures are added to the system while the pressure energy of a natural gas pipe network is fully utilized, and the equipment space and the use cost are not obviously increased.
At present, the leakage prevention method for natural gas pressure energy in China is generally external oil sealing or air source sealing, and is large in occupied area, high in cost and not suitable for small and miniature natural gas power generation.
Disclosure of Invention
The invention aims to provide a simple connecting shaft protection method and device for small-sized natural gas pressure energy power generation aiming at the leakage hidden trouble and the defect of the existing small-sized pipe network natural gas pressure energy power generation device so as to achieve the purposes of preventing natural gas dynamic sealing leakage, protecting high-speed rotating parts by using a sleeve, preventing a coupler from breaking and splashing, improving a system performance monitoring means, not increasing new potential safety hazards, not increasing equipment occupied area and the like.
The technical scheme for realizing the aim of the invention is as follows:
A simple connecting shaft protection device for small-sized natural gas pressure energy power generation comprises a hollow shaft coupling protection device, an information display device and a thread compression sealing device; the screw thread compression sealing device is symmetrically connected to two ends of the coupler protection device through screw threads, the coupler protection device is arranged between the opposite sealing end surfaces of the pneumatic motor and the explosion-proof generator in a sealing mode through the screw thread compression sealing device and covers the coupler of the pneumatic motor and the explosion-proof generator, and flame-retardant gas with certain pressure is injected into a sealing inner cavity surrounded by the opposite sealing end surfaces of the coupler protection device, the screw thread compression sealing device, the pneumatic motor and the explosion-proof generator; the information display device is connected and arranged on the outer wall of the coupler protection device and is used for monitoring the real-time air pressure and temperature in the coupler protection device.
Preferably, the coupler protection device comprises a sleeve with external threads arranged at two ends, wherein the thickness of the sleeve is 3-5mm, and the inner diameter of the sleeve is 5-10mm larger than the outer diameter of the coupler.
Preferably, the length of the sleeve is 8-12mm less than the spacing between the opposed sealing faces of the air motor and the explosion-proof generator.
Preferably, the outer wall of the sleeve is provided with a gas filling port.
Preferably, the two ends of the sleeve are provided with external threads of 8-15 mm.
Preferably, the material of the sleeve comprises metal and engineering plastic.
Preferably, the information display device comprises a temperature transmitter and a pressure transmitter, which are respectively arranged on the outer wall of the sleeve close to the end part and used for monitoring the real-time air pressure and temperature in the sleeve. The pressure is used for judging whether the equipment has a natural gas leakage phenomenon or not, and when the pressure rises, the natural gas leakage is judged; when the pressure was lowered, it was judged that nitrogen was leaking. In addition, through can accomplishing real-time detection and data statistics, these two kinds of transmitter data can effectively make judgement and prediction to the life-span of coupling, remind maintenance to change and prepare.
Preferably, the screw compression sealing device comprises an internal screw nut and a sealing gasket, wherein the internal screw nut is in sealing connection with the external screw thread at the end part of the sleeve, and the sealing gasket is sleeved on the sleeve and is positioned between the contact surfaces of the internal screw nut and the sealing end surface.
Preferably, the sealing gasket is an O-shaped sealing ring, and annular sealing grooves matched with the sealing gasket are formed in the sealing end faces of the pneumatic motor and the explosion-proof generator.
Preferably, the flame retardant gas comprises nitrogen, helium, argon and the like, and the pressure value of the flame retardant gas is lower than the outlet pressure value of the natural gas and higher than the atmospheric environment pressure value.
Compared with the prior art and the current situation, the invention has the following beneficial effects:
1. The equipment has lower implementation cost, has multiple functions and realizes danger prevention and early warning. The device is characterized in that the coupler and the sealing surface easy to leak are placed in the metal pipeline through screw fastening without additional production and high-precision processing technology, so that the natural gas which is possibly leaked is isolated on a propagation path, and meanwhile, accidents are predicted and early warned by utilizing the change of temperature and pressure data of the equipment.
2. The whole set of device is simple to operate and convenient to maintain. The device can be operated without increasing manual operation, and only needs to be maintained regularly. And whether natural gas leaks or not can be judged, manual supervision is reduced, and the operation safety of a pipe network is greatly improved. The pressure energy power generation device can be gradually popularized and applied to the small and miniature natural gas pipe network in the future, and the safety guarantee degree of the technology is improved.
3. The whole set of device occupies small area and has wide application range. The device only adds the sleeve outside the original coupling, and can be used under various working conditions as no accessory equipment is needed.
Drawings
Fig. 1 is a diagram of a simple connecting shaft protection device for small and miniature natural gas pressure energy power generation.
Fig. 2 is a schematic diagram of a compression connection structure of a sleeve and a nut.
The figure shows: 1-high-pressure natural gas inlet, 2-pneumatic motor, 3-sealing end face, 4-temperature transmitter, 5-pressure transmitter, 6-coupling, 7-explosion-proof generator, 8-internal screw nut, 9-external screw thread, 10-sleeve pipe, 11-gas filler, 12-sealing gasket, 13-low-pressure natural gas outlet.
Detailed Description
For a better understanding of the present invention, reference will now be made to the following description of the invention taken in conjunction with the accompanying drawings and examples, which are included to illustrate and not limit the scope of the invention.
Taking a pressure regulating box of a natural gas pipeline as an example, the micro pressure energy power generation project of 200W is adopted, the natural gas flow of the pipeline is about 100Nm 3/h, the inlet pressure is 0.8MPa, and the pressure is reduced by 0.1 MPa.
As shown in fig. 1, natural gas enters the pneumatic motor 2 through the high-pressure natural gas inlet 1 to do work, and drives the explosion-proof generator 7 through the coupling 6, and the explosion-proof generator 7 can generate 200W of electric quantity. The expanded natural gas enters the downstream gas network through the low pressure natural gas outlet 13. The overall appearance of the natural gas pressure energy power generation equipment is about 1m long, 0.8m wide and 0.6m high.
In order to achieve the purpose of the invention, the embodiment adopts the following technical scheme:
As shown in figure 1, the simple connecting shaft protection device for small and miniature natural gas pressure energy power generation comprises a hollow shaft coupling protection device, an information display device and a thread compression sealing device; the screw thread compression sealing device is symmetrically connected to two ends of the coupler protection device through screw threads, the coupler protection device is arranged between the opposite sealing end surfaces 3 of the pneumatic motor 2 and the explosion-proof generator 7 in a sealing mode through the screw thread compression sealing device and covers the coupler 6 of the pneumatic motor 2 and the explosion-proof generator 7, and flame-retardant gas with certain pressure is injected into a sealing inner cavity surrounded by the coupler protection device, the screw thread compression sealing device, the opposite sealing end surfaces 3 of the pneumatic motor 2 and the explosion-proof generator 7; the information display device is connected and arranged on the outer wall of the coupler protection device and is used for monitoring the real-time air pressure and temperature in the coupler protection device.
The coupling protection device comprises a sleeve 10 with external threads of 10mm at two ends, wherein the sleeve 10 is made of stainless steel pipes, and it is understood that engineering plastics or other suitable materials with sufficient strength can be adopted as the sleeve 10. The sleeve 10 has a thickness of 5mm and an inner diameter 5mm larger than the outer diameter of the coupling 6. The length of the sleeve 10 is 10mm less than the distance between the opposing sealing faces 3 of the air motor 2 and the explosion-proof generator 7. The outer wall of the sleeve 10 is provided with a gas filling port 11, so that flame retardant gas with certain pressure can be conveniently filled.
The information display device comprises a temperature transmitter 4 and a pressure transmitter 5 which are respectively arranged on the outer wall of the sleeve 10 and used for monitoring the real-time air pressure and temperature in the sleeve 10, in the embodiment, the temperature transmitter 4 and the pressure transmitter 5 can display the pressure and temperature data in the sleeve 10, the temperature is used for reflecting the temperature of the coupler 6, and the running condition, the abrasion degree and the release fracture of the coupler 6 can be judged. The pressure is used for judging whether the equipment has a natural gas leakage phenomenon or not, and when the pressure rises, the natural gas leakage is judged; when the pressure is reduced, the flame retardant gas is judged to be leaked. In addition, through real-time detection and data statistics, the two transmitter data can effectively judge and predict the service life of the coupler 6, and remind maintenance, overhaul and replacement preparation.
As shown in fig. 2, the screw compression sealing device comprises an internal screw nut 8 and a sealing washer 12, wherein the internal screw nut 8 is in sealing connection with the external screw thread at the end part of the sleeve 10, and if necessary, a sealing adhesive tape can be wound on the external screw thread at the end part of the sleeve 10 to ensure the sealing effect of the internal screw nut and the external screw thread. The sealing washer 12 is sleeved on the sleeve 10 and is positioned between the contact surfaces of the internal threaded nut 8 and the sealing end surface 3. The movable joint type screw thread support fixing mode is adopted in the implementation, the length adjustable range is large, and the movable joint type screw thread support fixing mode is convenient to assemble and disassemble.
The sealing gasket 12 is an O-ring, and the sealing end surfaces 3 of the pneumatic motor 2 and the explosion-proof generator 7, which are opposite, are provided with annular sealing grooves matched with the sealing gasket 12, namely, the sealing gasket plays a role in sealing, and meanwhile, the sealing gasket 12 and even the sleeve 10 are positioned, so that the sealing gasket is kept coaxial with the coupling 6 as much as possible.
In one embodiment, the flame retardant gas is nitrogen, and the pressure value of the nitrogen is lower than the outlet pressure value of the natural gas and higher than the atmospheric pressure value, and in this embodiment, the pressure of the nitrogen is 0.4MPa.
The sealing end face 3 of the pneumatic motor 2 is easy to leak air due to abrasion, the leaked natural gas is directly contacted with air, and once the friction spark occurs on the coupling 6, the safety hidden trouble exists. The sleeve 10 can be filled with micro-positive pressure nitrogen through the gas filling port 11 when each device works normally, and the mode not only prevents natural gas from directly contacting with air after leakage, prevents combustion, and eliminates a dangerous source. Moreover, the sleeve 10 can prevent the damage or spark generation of other equipment caused by the splashing of fragments at high rotation speed after the instantaneous fracture of the internal coupling 6, and can effectively prevent the pollution and damage of environmental impurities to the coupling 6.
During installation, the two internal thread nuts 8 are gradually moved to two sides by rotating the internal thread nuts 8 at the two ends of the sleeve 10 until the sealing gasket 12 is pressed to the annular sealing groove, and the pneumatic motor 2 and the explosion-proof generator 7 are subjected to enough pre-tightening pressure, so that the tightness and the stability are ensured.
Then, nitrogen gas is introduced through the gas filling port 11, and the pressure of the nitrogen gas is 0.4MPa, so that the pressure transmitter can judge conveniently. Meanwhile, the temperature transmitter and the pressure transmitter probes should be close to two sides as much as possible, so as to prevent the intermediate coupling 6 from jumping greatly and interfering with the transmitter.
When the equipment works normally, the temperature transmitter 4 should be kept in a certain indication range continuously, and when the temperature is too high compared with the normal working temperature, the temperature rises due to abrasion of the coupler 6 or the temperature rises due to friction with other structures after the integral deformation; when the temperature is too low, the coupling 6 breaks, the air motor 2 is in an idle state, and the spindle rotation temperature drops sharply. At this time, it is proved that the pressure energy power generation system is abnormal and needs to be overhauled.
When the device is working normally, the pressure transmitter 5 should be kept in a certain indication range continuously, if the pressure is too high or too low, the device is proved to have gas leakage or nitrogen leakage, and maintenance is needed.
Before maintenance, the whole set of pressure energy power generation equipment is stopped, and the front valve and the rear valve are closed. And opening a gas filling port 11, detecting the concentration of natural gas, and loosening the internal threaded nuts 8 at the two sides for overhauling.
The above examples of the present invention are merely illustrative of the present invention and are not intended to limit the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (7)
1. A simple and easy connecting shaft protection device for little miniature natural gas pressure energy electricity generation, its characterized in that: the device comprises a hollow coupler protection device, an information display device and a thread compression sealing device; the screw thread compressing and sealing device is symmetrically connected to two ends of the coupling protecting device through screw threads, the coupling protecting device is arranged between the sealing end faces (3) opposite to the pneumatic motor (2) and the explosion-proof generator (7) in a sealing mode through the screw thread compressing and sealing device and covers the coupling (6) of the pneumatic motor (2) and the explosion-proof generator (7), and flame-retardant gas with certain pressure is injected into a sealing inner cavity surrounded by the sealing end faces (3) opposite to the pneumatic motor (2) and the explosion-proof generator (7); the information display device is connected to the outer wall of the coupler protection device and is used for monitoring the real-time air pressure and temperature in the coupler protection device; the coupler protection device comprises a sleeve (10) with external threads at two ends, wherein the thickness of the sleeve (10) is 3-5mm, and the inner diameter of the sleeve is 5-10mm larger than the outer diameter of the coupler (6); the length of the sleeve (10) is 8-12mm less than the distance between the opposite sealing end surfaces (3) of the pneumatic motor (2) and the explosion-proof generator (7); the screw thread compressing and sealing device comprises an internal thread nut (8) and a sealing gasket (12), wherein the internal thread nut (8) is in sealing connection with external threads at the end part of the sleeve (10), and the sealing gasket (12) is sleeved on the sleeve (10) and is positioned between contact surfaces of the internal thread nut (8) and the sealing end face (3).
2. The simple and easy axle protection device for small and miniature natural gas pressure energy power generation of claim 1, characterized in that: the outer wall of the sleeve (10) is provided with a gas filling port (11).
3. The simple and easy axle protection device for small and miniature natural gas pressure energy power generation of claim 1, characterized in that: external threads of 8-15mm are arranged at two ends of the sleeve (10).
4. The simple and easy axle protection device for small and miniature natural gas pressure energy power generation of claim 1, characterized in that: the material of the sleeve (10) comprises metal and engineering plastic.
5. The simple and easy axle protection device for small and miniature natural gas pressure energy power generation of claim 1, characterized in that: the information display device comprises a temperature transmitter (4),
And the pressure transmitters (5) are respectively arranged on the outer walls of the sleeve (10) close to the end parts and are used for monitoring the real-time air pressure and the temperature in the sleeve (10).
6. The simple and easy axle protection device for small and miniature natural gas pressure energy power generation of claim 1, characterized in that: the sealing gasket (12) is an O-shaped sealing ring, and annular sealing grooves matched with the sealing gasket (12) are formed in the sealing end faces (3) of the pneumatic motor (2) and the explosion-proof generator (7) which are opposite to each other.
7. The simple and easy axle protection device for small and miniature natural gas pressure energy power generation of claim 1, characterized in that: the flame-retardant gas comprises nitrogen, helium and argon, and the pressure value of the flame-retardant gas is lower than the pressure value of the natural gas outlet and higher than the pressure value of the atmospheric environment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910037341.9A CN109780206B (en) | 2019-01-15 | Simple connecting shaft protection device for small and miniature natural gas pressure energy power generation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910037341.9A CN109780206B (en) | 2019-01-15 | Simple connecting shaft protection device for small and miniature natural gas pressure energy power generation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109780206A CN109780206A (en) | 2019-05-21 |
| CN109780206B true CN109780206B (en) | 2024-07-09 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103422899A (en) * | 2013-08-09 | 2013-12-04 | 华南理工大学 | Process and device for generating power by pressure energy of small natural gas pipeline network |
| CN206530450U (en) * | 2017-03-02 | 2017-09-29 | 重庆科技学院 | Built-in natural gas line differential pressure generating device |
| CN209587127U (en) * | 2019-01-15 | 2019-11-05 | 广东众通利华能源科技有限公司 | A kind of simple connecting shaft protective device for small miniature pressure energy of natural gas power generation |
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103422899A (en) * | 2013-08-09 | 2013-12-04 | 华南理工大学 | Process and device for generating power by pressure energy of small natural gas pipeline network |
| CN206530450U (en) * | 2017-03-02 | 2017-09-29 | 重庆科技学院 | Built-in natural gas line differential pressure generating device |
| CN209587127U (en) * | 2019-01-15 | 2019-11-05 | 广东众通利华能源科技有限公司 | A kind of simple connecting shaft protective device for small miniature pressure energy of natural gas power generation |
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Effective date of registration: 20240614 Address after: Room 1002-2, Building 7, Shunzhi Science and Technology Innovation Park, No. 4 Huanzhen East Road, Guanglong Industrial Zone, Chencun Town, Shunde District, Foshan City, Guangdong Province, 528313 Applicant after: Foshan huanshengtong New Energy Technology Co.,Ltd. Country or region after: China Applicant after: SOUTH CHINA University OF TECHNOLOGY Address before: 528314 Shunde District, Foshan City, Guangdong Province, Chencun Town, Chihua Residential Committee Guanglong Industrial Park, 18 Xingye Road, Shunlian Machinery City, 22 401 rooms Applicant before: GUANGDONG ZHONGTONGLIHUA ENERGY TECHNOLOGY Co.,Ltd. Country or region before: China Applicant before: SOUTH CHINA University OF TECHNOLOGY |
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