CN205538578U - Performance detection device of high-pressure gas filtering filter element - Google Patents
Performance detection device of high-pressure gas filtering filter element Download PDFInfo
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- CN205538578U CN205538578U CN201620082481.XU CN201620082481U CN205538578U CN 205538578 U CN205538578 U CN 205538578U CN 201620082481 U CN201620082481 U CN 201620082481U CN 205538578 U CN205538578 U CN 205538578U
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- filter core
- cylindrical body
- pressure
- detecting performance
- filter element
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- 238000001514 detection method Methods 0.000 title claims abstract description 15
- 238000001914 filtration Methods 0.000 title abstract description 8
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 3
- 239000010935 stainless steel Substances 0.000 claims abstract description 3
- 239000007789 gas Substances 0.000 claims description 34
- 238000007599 discharging Methods 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 9
- 230000009467 reduction Effects 0.000 claims description 2
- 239000002245 particle Substances 0.000 abstract description 7
- 239000007788 liquid Substances 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 abstract 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 30
- 239000003345 natural gas Substances 0.000 description 15
- 238000012360 testing method Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000005427 atmospheric aerosol Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000001728 nano-filtration Methods 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 238000013441 quality evaluation Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Measuring Fluid Pressure (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The utility model discloses a performance detection device of high-pressure gas filter core belongs to the filtration equipment field. The performance detection device includes: the air inlet unit, the detection unit and the air outlet unit are sequentially communicated through connecting pipelines, and the connecting pipelines are stainless steel pipes resistant to pressure of at least 12 MPa. In the detection unit, a ball valve is arranged on an upstream pipeline of a filter element clamping piece, and a pressure regulating valve, a flowmeter and a one-way valve are arranged on a downstream pipeline of the filter element clamping piece; the pressure difference transmitter is connected with the inlet end and the outlet end of the filter element clamping piece; the particle counter is connected with the inlet end and the outlet end of the detection unit. In the filter element clamping piece, an upper end cover is detachably and hermetically connected with the upper end of a cylindrical body, the inner cavity of the cylindrical body is cylindrical, the diameter of the inner cavity of the cylindrical body is larger than that of the filter element, and a coaxial groove is formed in the bottom of the cylindrical body to accommodate the protruding bottom end of the filter element; the air inlet pipe is communicated with the groove, and the air outlet pipe and the liquid discharge pipe are communicated with the inner cavity of the cylindrical body. The device can accurately detect the performance of the high-pressure gas filtering filter element.
Description
Technical field
The utility model relates to filter plant field, and the performance particularly to a kind of gases at high pressure filter core detects dress
Put.
Background technology
Three kinds of filter cores, the process gas mistake of conveying natural gas is commonly used at present in Long-distance Transmission Pipeline compressor station
Filter insert, the filter element of centrifugal compressor dry gas seals and the filter element of gas turbine fuel gas.Above
Three kinds of filter cores are all for removing solid particle, water and the hydro carbons drop contained in natural gas.Wherein, centrifugal compressor dry gas seals
Filter core can effectively remove the impurity in the gas entered in centrifugal compressor dry gas sealing device, and its natural gas filtered is the highest
Pressure can reach 12MPa, and as the core parts of dry gas seals filter, the performance of this filter core will directly affect centrifugal compressor
Safe and reliable operation, so, its performance is detected the most necessary.
At present, references many to filter element criteria of quality evaluation " high efficiency particle air filter method for testing performance efficiency and
Resistance " (standard GB/T/T 6165-2008), but this standard is mainly for atmospheric aerosol particle, and at atmosheric pressure
Test.But, designer finds, the main body of natural gas line compressor station filtration dry gas seals filter core is hollow cylinder
Shape, and the filter core clamping device that prior art provides mostly is the rhombus designed for filter material and leaf filter or square folder
Holding, it cannot consolidate clamping dry gas seals filter core.Additionally, designer studies discovery, under high pressure, gas is not only close by gas
The impact that degree and viscosity increase, is also changed by filter media construction simultaneously and is affected.Along with the rising of pressure, filtering material is thick
Degree, the isoparametric change of porosity and aperture, will form restriction, at atmosheric pressure to dry gas seals to the flow channel of fluid
Filter core carries out detection cannot obtain testing result exactly.
Understand based on above-mentioned, it is provided that a kind of filter element for centrifugal compressor dry gas seals, and can be at high pressure
Under that it is carried out the device of performance detection is the most necessary.
Utility model content
The utility model embodiment technical problem to be solved is, it is provided that the property of a kind of gases at high pressure filter core
Device can be detected.Concrete technical scheme is as follows:
The device for detecting performance of a kind of gases at high pressure filter core, wherein, described device for detecting performance includes: by connecting
Air admission unit that pipeline sequentially connects, detector unit, outlet cell, described connection pipeline is the stainless of resistance at least 12MPa pressure
Steel pipe；
Described detector unit include ball valve, filter core holder, pressure-regulating valve, flowmeter, check valve, corpuscular counter,
Pressure difference transmitter；Described ball valve is arranged on the upstream line of described filter core holder, described pressure-regulating valve, described flow
Meter, described check valve are successively set on the downstream line of described filter core holder；Described pressure difference transmitter presss from both sides with described filter core
The entrance point of gripping member and the port of export connect；Described corpuscular counter is connected with entrance point and the port of export of described detector unit；
Described filter core holder includes: upper end cover, cylindrical body, air inlet pipe, escape pipe, discharging tube；Described upper end cover with
The upper end of described cylindrical body is removably tightly connected, and the inner chamber of described cylindrical body is diametrically more than the body diameter of filter core
Cylinder, and bottom is provided with coaxial groove, and described groove is for accommodating the bump bottom ends of described filter core；Described air inlet pipe
Be connected with described groove, described escape pipe, described discharging tube all with the intracavity inter-connection of described cylindrical body.
Further, described device for detecting performance also includes that blowoff valve, described blowoff valve are connected with described discharging tube.
Specifically, as preferably, the cavity heights 11-12cm higher than the body height of described filter core of described cylindrical body；
The diameter of the inner chamber of described cylindrical body is than the big 2-3cm of body diameter of described filter core；The diameter of described groove is than described filter core
The big 0.5-0.7mm of diameter of bump bottom ends.
Specifically, as preferably, described filter core holder also includes that sealing ring, described sealing ring are arranged on described groove
In, it is in close contact with the bump bottom ends of described filter core.
Alternatively, in described filter core holder, the edge of described upper end cover and the top edge of described cylindrical body are provided with
Corresponding bolt hole, by using fastening bolt to pass described bolt hole, with by tight to described upper end cover and described cylindrical body
Gu together.
Alternatively, in described filter core holder, described upper end cover bottom is provided with blind hole, is provided with interior spiral shell in described blind hole
Line, the upper end outer wall of described cylindrical body is provided with external screw thread, so that described upper end cover is threadeded with described cylindrical body.
Specifically, as preferably, described air admission unit includes the air inlet pipe being connected with the entrance point of described detector unit
Road, the first pressure transmitter being successively set on described admission line, the first Pressure gauge, temperature transmitter；
Described outlet cell include the outlet pipe being connected with the port of export of described detector unit, be successively set on described
The second pressure transmitter on outlet pipe, the second Pressure gauge.
Specifically, as preferably, described device for detecting performance includes the detector unit that two sets are connected in parallel, and two overlap described inspection
Survey corpuscular counter described in units shared.
Further, described device for detecting performance also includes 4 atmospheric valves, is separately positioned on the import of described detector unit
On the connection pipeline connecting pipeline and the port of export of end.
The technical scheme that the utility model embodiment provides has the benefit that
The device for detecting performance with said structure that the utility model embodiment provides, by making filter core holder for such as
Upper structure so that it is be suitable to clamp gases at high pressure filter core is when detecting the performance of gases at high pressure filter core, permissible
High-pressure natural gas is as test medium, at 0-1000Nm3In the range of flow of/h and the pressure limit of 0-12MPa, by natural
Feed channel filtration dry gas seals filter core (i.e. gases at high pressure filter core) is put in filter core holder, and adjusts at ball valve, pressure
Save and under the mating reaction of valve, flowmeter, check valve, corpuscular counter, pressure difference transmitter, its performance is detected, obtain sky
The particle concentration that so gas is contained in it before and after entering detector unit, enters the filter core of gases at high pressure authentic and validly
Row performance detects.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme in the utility model embodiment, required in embodiment being described below
Accompanying drawing to be used is briefly described, it should be apparent that, the accompanying drawing in describing below is only realities more of the present utility model
Execute example, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to according to these accompanying drawings
Obtain other accompanying drawing.
Fig. 1 is the structural representation of the device for detecting performance of the gases at high pressure filter core that the utility model embodiment provides
Figure；
Fig. 2 is the structural representation of the filter core holder that the another embodiment of the utility model provides.
Reference represents respectively:
1 air admission unit,
101 first pressure transmitters, 102 first Pressure gauges, 103 temperature transmitters,
2 detector units,
201 ball valves, 202 filter core holders, 203 pressure-regulating valves, 204 flowmeters, 205 check valves,
206 corpuscular counters, 207 pressure difference transmitters, 208 blowoff valves, 209 atmospheric valves,
2021 upper end covers, 2022 cylindrical body, 2023 air inlet pipe, 2024 escape pipes, 2025 discharging tubes,
2026 sealing rings,
3 outlet cell,
301 second pressure transmitters, 302 second Pressure gauges,
4 filter cores.
Detailed description of the invention
For making the purpose of this utility model, technical scheme and advantage clearer, new to this practicality below in conjunction with accompanying drawing
Type embodiment is described in further detail.
As shown in Figure 1, the utility model embodiment provides the device for detecting performance of a kind of gases at high pressure filter core,
This device for detecting performance includes: by connect pipeline sequentially connect air admission unit 1, detector unit 2, outlet cell 3, wherein,
This connection pipeline is the stainless steel tube of resistance at least 12MPa pressure.Wherein, detector unit 2 includes: ball valve 201, filter core holder
202, pressure-regulating valve 203, flowmeter 204, check valve 205, corpuscular counter 206, pressure difference transmitter 207；Ball valve 201 is arranged
On the upstream line of filter core holder 202, pressure-regulating valve 203, flowmeter 204, check valve 205 are successively set on filter core folder
On the downstream line of gripping member 202；Pressure difference transmitter 207 is connected with entrance point and the port of export of filter core holder 202；Particle counting
Device 206 is connected with entrance point and the port of export of detector unit 2.
As shown in Figure 2, this filter core holder 202 includes: upper end cover 2021, cylindrical body 2022, air inlet pipe 2023, go out
Tracheae 2024, discharging tube 2025.Upper end cover 2021 is removably tightly connected with the upper end of cylindrical body 2022, cylindrical body
The inner chamber of 2022 is diametrically more than the cylinder of the body diameter of filter core 4, and bottom is provided with coaxial groove, and groove is used for holding
The bump bottom ends of nanofiltration core 4；Air inlet pipe 2023 is connected with groove, and escape pipe 2024, discharging tube 2025 are all and cylindrical body
The intracavity inter-connection of 2022.
Specifically, the operation principle of the device for detecting performance that the utility model embodiment provides is as follows:
It is first turned on the upper end cover 2021 of filter core holder 202, gases at high pressure filter core 4 is put into cylindrical body 2022
In so that it is bump bottom ends is securely placed in the groove within cylindrical body 2022, then makes upper end cover 2021 with tubular originally
Body 2022 is tightly connected.Subsequently, make the ball valve 201 that high-pressure natural gas enters in detector unit 2 by air admission unit 1 carries out flow
Regulation, subsequently by the air inlet pipe 2023 on filter core holder 202 by lower from natural gas by filter core, after filter core 4 filters
Discharged by escape pipe 2024, and enter outlet cell 3 receive through pressure-regulating valve 203, flowmeter 204, check valve 205 successively
Collection.Wherein, the effect of pressure-regulating valve 203 is to ensure that the flow by device two branch road natural gas and pressure are identical, flowmeter
204 are used for measuring the flow of the natural gas passed through in filter core 4, and check valve 205 is used for making natural gas proceed directly to after flowing out filter core 4
Outlet cell 3.And, in the process, by using corpuscular counter 206 that the particle concentration in high-pressure natural gas is carried out
The real time measure, by the pressure reduction before and after using pressure difference transmitter 207 to measure filter core.By operating as above, can be to natural gas
The performance of filter pipeline dry gas seals filter core carries out effectively detecting accurately.
From the foregoing, the device for detecting performance with said structure that the utility model embodiment provides, by making filter
Core holder 202 is constituted above so that it is be suitable to clamp gases at high pressure filter core, in the performance to gases at high pressure filter core
When detecting, can be using high-pressure natural gas as test medium, at 0-1000Nm3The range of flow of/h and the pressure of 0-12MPa
In the range of power, natural gas line filtration dry gas seals filter core (i.e. gases at high pressure filter core) is put into filter core holder 202
In, and at ball valve 201, pressure-regulating valve 203, flowmeter 204, check valve 205, corpuscular counter 206, pressure difference transmitter 207
Mating reaction under its performance is detected, obtain the particulate matter that natural gas is contained in it before and after entering detector unit 2
Concentration, carries out performance detection to the filter core of gases at high pressure authentic and validly.
Further, the device for detecting performance that the utility model embodiment provides also includes blowoff valve 208, blowoff valve 208
It is connected with the discharging tube 2025 in filter core holder 202, discharges with the greasy dirt that filter element filtering is obtained.
Further, in this filter core holder 202, the cavity heights of cylindrical body 2022 is higher than the body height of filter core 4
11-12cm；The diameter of the inner chamber of cylindrical body 2022 is than the big 2-3cm of body diameter of filter core 4；The diameter of groove is than filter core 4
The big 0.5-0.7mm of diameter of bump bottom ends.And this filter core holder 202 also includes that sealing ring 2026, sealing ring 2026 are arranged on
In groove, it is in close contact with the bump bottom ends of filter core 4.It is arranged such, on the one hand makes filter core 4 to be detected insert cylinder easily
In shape body 2022, on the other hand, filter core 4 to be detected can be made to be in sealing contact with the groove in cylindrical body 2022, to ensure
The air inlet inputted by air inlet pipe 2023 can fully enter in filter core.
Specifically, in the filter core holder 202 that the utility model embodiment provides, for the ease of dismantling or installing end cap
2021, and then be beneficial to change filter core to be detected, make upper end cover 2021 removably connect with cylindrical body 2022.In order to realize two
Removably connecting between person, can use two kinds of optional modes of the following stated: the first, at edge and the cylinder of upper end cover 2021
Corresponding bolt hole is set on the top edge of shape body 2022, by using fastening bolt by upper end cover 2021 and cylindrical body
2022 tighten together.It two is to arrange blind hole in upper end cover 2021 bottom, be provided with internal thread, in cylindrical body in blind hole
On the upper end outer wall of 2022, external screw thread is set, so that upper end cover 2021 is threadeded with cylindrical body 2022.
Specifically, in the utility model embodiment, air admission unit 1 includes and entering that the entrance point of detector unit 2 is connected
Feed channel, first pressure transmitter the 101, first Pressure gauge 102 being successively set on admission line, temperature transmitter 103.Go out
Gas unit 3 includes the outlet pipe being connected with the port of export of detector unit 2, the second pressure being successively set on outlet pipe
Transmitter the 301, second Pressure gauge 302.By being defined as above air admission unit 1 and outlet cell 3, its effect is to observe filter
The real-time environmental conditions of core Site Detection.
As preferably, the device for detecting performance that the utility model embodiment provides includes the detector unit that two sets are connected in parallel
2, two set detector units 2 share a corpuscular counter 206.The device for detecting performance that the utility model embodiment provides includes two
Two filter cores can be carried out contrast detection, to improve detection efficiency by individual identical detection branch simultaneously.
Further, the device for detecting performance that the utility model embodiment provides also includes 4 atmospheric valves 209, respectively
Be arranged on the entrance point of detector unit 2 and the connection pipeline of the port of export, with performance each time detect after to this performance
Detection device carries out pressure release process.
Further, it is to be appreciated that in the utility model embodiment, flowmeter 204, corpuscular counter 206, pressure regulate
Valve 203, pressure difference transmitter 207 and each pressure transmitter, Pressure gauge and temperature transmitter all and terminal device, such as, calculate
They are controlled in real time by mechatronics in order to computer, and are transferred in computer store by the data measured.
The foregoing is only preferred embodiment of the present utility model, not in order to limit protection domain of the present utility model,
All within spirit of the present utility model and principle, any modification, equivalent substitution and improvement etc. made, should be included in this reality
Within novel protection domain.
Claims (9)
1. the device for detecting performance of a gases at high pressure filter core, it is characterised in that described device for detecting performance includes: pass through
Connect pipeline sequentially connect air admission unit, detector unit, outlet cell, described connection pipeline is resistance at least 12MPa pressure
Stainless steel tube；
Described detector unit includes ball valve, filter core holder, pressure-regulating valve, flowmeter, check valve, corpuscular counter, pressure reduction
Transmitter；Described ball valve is arranged on the upstream line of described filter core holder, described pressure-regulating valve, described flowmeter, institute
State check valve to be successively set on the downstream line of described filter core holder；Described pressure difference transmitter and described filter core holder
Entrance point and the port of export connect；Described corpuscular counter is connected with entrance point and the port of export of described detector unit；
Described filter core holder includes: upper end cover, cylindrical body, air inlet pipe, escape pipe, discharging tube；Described upper end cover is with described
The upper end of cylindrical body is removably tightly connected, and the inner chamber of described cylindrical body is diametrically more than the circle of the body diameter of filter core
Cylindricality, and bottom is provided with coaxial groove, described groove is for accommodating the bump bottom ends of described filter core；Described air inlet pipe and institute
State groove to be connected, described escape pipe, described discharging tube all with the intracavity inter-connection of described cylindrical body.
Device for detecting performance the most according to claim 1, it is characterised in that described device for detecting performance also includes blowdown
Valve, described blowoff valve is connected with described discharging tube.
Device for detecting performance the most according to claim 1, it is characterised in that the cavity heights ratio of described cylindrical body is described
The body height height 11-12cm of filter core；The diameter of the inner chamber of described cylindrical body is than the big 2-3cm of body diameter of described filter core；
The diameter 0.5-0.7mm bigger than the diameter of the bump bottom ends of described filter core of described groove.
Device for detecting performance the most according to claim 3, it is characterised in that described filter core holder also includes sealing ring,
Described sealing ring is arranged in described groove, is in close contact with the bump bottom ends of described filter core.
Device for detecting performance the most according to claim 1, it is characterised in that in described filter core holder, described upper end cover
Edge and the top edge of described cylindrical body be provided with corresponding bolt hole, by using fastening bolt through described bolt
Hole, to tighten together described upper end cover and described cylindrical body.
Device for detecting performance the most according to claim 1, it is characterised in that in described filter core holder, described upper end cover
Bottom is provided with blind hole, is provided with internal thread in described blind hole, and the upper end outer wall of described cylindrical body is provided with external screw thread, with
Described upper end cover is made to threaded with described cylindrical body.
Device for detecting performance the most according to claim 1, it is characterised in that described air admission unit includes single with described detection
The admission line that the entrance point of unit is connected, the first pressure transmitter being successively set on described admission line, the first pressure
Table, temperature transmitter；
Described outlet cell includes the outlet pipe being connected with the port of export of described detector unit, be successively set on described in give vent to anger
The second pressure transmitter on pipeline, the second Pressure gauge.
Device for detecting performance the most according to claim 1, it is characterised in that described device for detecting performance includes that two sets are in parallel
The detector unit connected, two overlap described detector unit shares described corpuscular counter.
Device for detecting performance the most according to claim 8, it is characterised in that described device for detecting performance also includes that 4 put
Empty valve, on the connection pipeline connecting pipeline and the port of export of the entrance point being separately positioned on described detector unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620082481.XU CN205538578U (en) | 2016-01-27 | 2016-01-27 | Performance detection device of high-pressure gas filtering filter element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620082481.XU CN205538578U (en) | 2016-01-27 | 2016-01-27 | Performance detection device of high-pressure gas filtering filter element |
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| Publication Number | Publication Date |
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| CN205538578U true CN205538578U (en) | 2016-08-31 |
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| CN201620082481.XU Active CN205538578U (en) | 2016-01-27 | 2016-01-27 | Performance detection device of high-pressure gas filtering filter element |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106769766A (en) * | 2016-12-23 | 2017-05-31 | 奇竹（北京）科技发展有限公司 | Cylinder air purifying filter element performance evaluation detector |
| CN107144509A (en) * | 2017-05-17 | 2017-09-08 | 深圳朝伟达科技有限公司 | A kind of filter core performance measurement method of natural gas filtering separation equipment |
| CN112284958A (en) * | 2020-09-08 | 2021-01-29 | 中石化宁波工程有限公司 | System and method for measuring solid content of gas conveyed by pipe |
-
2016
- 2016-01-27 CN CN201620082481.XU patent/CN205538578U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106769766A (en) * | 2016-12-23 | 2017-05-31 | 奇竹（北京）科技发展有限公司 | Cylinder air purifying filter element performance evaluation detector |
| CN107144509A (en) * | 2017-05-17 | 2017-09-08 | 深圳朝伟达科技有限公司 | A kind of filter core performance measurement method of natural gas filtering separation equipment |
| CN112284958A (en) * | 2020-09-08 | 2021-01-29 | 中石化宁波工程有限公司 | System and method for measuring solid content of gas conveyed by pipe |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20211230 Address after: Room 08-10, 6 / F, block a, No. 5, Dongtucheng Road, Chaoyang District, Beijing 100013 Patentee after: National Petroleum and natural gas pipeline network Group Co.,Ltd. Address before: 100007 Oil Mansion, 9 North Avenue, Dongcheng District, Beijing, Dongzhimen Patentee before: PetroChina Company Limited |
|
| TR01 | Transfer of patent right |