CN212770903U - Alkali metal heat pipe working medium purification and filling system - Google Patents
Alkali metal heat pipe working medium purification and filling system Download PDFInfo
- Publication number
- CN212770903U CN212770903U CN202021402963.1U CN202021402963U CN212770903U CN 212770903 U CN212770903 U CN 212770903U CN 202021402963 U CN202021402963 U CN 202021402963U CN 212770903 U CN212770903 U CN 212770903U
- Authority
- CN
- China
- Prior art keywords
- working medium
- cold trap
- pipe
- ball valve
- alkali metal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The utility model discloses an alkali metal heat pipe working medium purification and dress system that fills, include: the cold trap sedimentation system comprises a cold trap sedimentation tank, wherein the cold trap sedimentation tank is provided with a working medium inlet, a working medium outlet, a gas inlet pipe, a gas outlet pipe, an air inlet and an air outlet; a heating device; a stainless steel wire net filled in the cold trap settling tank; the heat pipe filling system comprises a standard container, wherein the standard container is provided with a working medium inlet, a working medium outlet, a main path air inlet pipe and a main path air outlet pipe; a thermostat; the device comprises a vacuum molecular pump set, an inert gas tank and a PLC (programmable logic controller), wherein the PLC is respectively connected with the cold trap settling tank, the standard container, the thermostat, the vacuum molecular pump set and the inert gas tank.
Description
Technical Field
The utility model relates to an alkali metal purifies and fills the dress field, concretely relates to alkali metal heat pipe working medium purification and fill dress system.
Background
The heat pipe is one of the most effective heat transfer elements, can transmit a large amount of heat in a long distance through a small sectional area without external power, is composed of a pipe shell, a liquid absorbing core and an end cover, continuously transfers the heat from a heat source to a heat sink device through evaporation, condensation and backflow of an internal working medium, and has the advantages of high heat transfer capacity, high temperature resistance, flexible structure and wide application field.
The high-temperature heat pipe shell is usually made of a high-temperature-resistant non-transparent material, and has the advantages of small temperature difference stress, simple structural form, high working temperature, good heat transfer performance and easiness in high-temperature damage. At present, the capillary core of a high-temperature heat pipe mainly adopts a wire mesh core, a metal felt, a channel and a combination form of the wire mesh core, the metal felt and the channel, and the high-temperature heat pipe is applied to the fields of heat protection of a hypersonic aircraft, nuclear engineering (space nuclear reactor cooling), a solar power station, a Stirling engine, a high-temperature hot blast stove, heat extraction of a high-temperature slag notch and a red heat body and the like.
The high-temperature heat pipe working medium is liquid metal sodium, potassium, lithium, cesium and other alkali metals. The working medium is usually active metal, is solid at normal temperature, and can generate an oxide film under the oxidation action of oxygen when exposed in the air, so that the glossiness is reduced, and the working medium is gray. In the heat pipe, the main index for evaluating the thermophysical properties of the working medium is the liquid phase transmission coefficient, and the specific application temperature ranges of the working medium are liquid metal sodium (700-1000K), potassium (600-900K) and lithium (100-1600K).
The existing alkali metal working medium purification and filling method comprises the following steps: (1) chinese patent application No. CN104075600A discloses weighing solid alkali metal working medium, melting, and pressurizing with inert gas to enter the heat pipe. The filling method can accurately control the filling quality and the working medium purity, but the filling method cannot fill a plurality of heat pipes simultaneously, inert gas enters the heat pipes, so that the process is complicated, and the problem that two liquid filling pipes are difficult to arrange on the tiny end faces of the heat pipes is solved. (2) The Chinese patent application with the publication number of CN101995181A can realize the simultaneous filling of a plurality of heat pipes, thereby improving the filling efficiency. However, the quality of the filled working medium is poor in error adjustment performance and the requirement for high-precision control of the quality of the working mediums of the plurality of heat pipes cannot be met. (3) The Chinese patent application with the publication number of CN105115328A adopts the method of putting quantitative solid alkali metal working media, pressing the molten alkali metal working media into the heat pipe by inert gas, and the method has simple filling and can well meet the filling requirement of a single heat pipe, but still has the problem of complex process caused by the inert gas entering the heat pipe. (4) Chinese patent application publication No. CN102172494A discloses that after absorbing impurities on the surface of alkali metal by using filter paper, the filter paper is put into a storage tank, which is likely to cause pollution of the alkali metal working medium.
The above application patents are all optimized for the heat pipe alkali metal working medium filling system, but the problems that the current small-sized alkali metal working medium purification and filling integration needs, the treatment after the alkali metal working medium is polluted in the filling process and the simultaneous high-precision filling of a plurality of heat pipes cannot be solved by comprehensively considering the existing patents.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an alkali metal heat pipe working medium purification and fill dress system to the above-mentioned not enough and defect of prior art to solve above-mentioned problem.
The utility model provides a technical problem can adopt following technical scheme to realize:
the utility model provides an alkali metal heat pipe working medium purification and fill dress system which characterized in that includes:
the cold trap sedimentation system comprises a cold trap sedimentation tank, wherein the cold trap sedimentation tank is provided with a working medium inlet for putting alkali metal to be purified, a working medium outlet connected with the standard container, a gas inlet pipe, a gas outlet pipe, an air inlet and an air outlet;
the heating device is arranged on the cold trap precipitation tank and used for heating the alkali metal working medium;
the stainless steel wire mesh is filled in the cold trap settling tank;
the heat pipe filling system comprises a standard container, wherein the standard container is provided with a working medium inlet connected with the cold trap settling tank, a working medium outlet connected with the heat pipe, a main air inlet pipe and a main air outlet pipe;
the constant temperature box is arranged outside the heat pipe and used for heating the heat pipe;
the vacuum molecular pump set is communicated with the cold trap settling tank and the gas inlet pipe and the main path gas inlet pipe of the standard container through branch gas inlet pipes, and the cold trap settling tank and the gas outlet pipe and the main path gas outlet pipe of the standard container are connected with the vacuum molecular pump set through branch gas return pipes;
the inert gas tank is used for filling inert gas and storing an alkali metal working medium, the inert gas tank is communicated with the cold trap settling tank and the gas inlet pipe and the main path gas inlet pipe of the standard container through a branch gas inlet pipe, and the cold trap settling tank is connected with the inert gas tank through a branch gas return pipe and the gas outlet pipe and the main path gas outlet pipe of the standard container;
and the PLC is respectively connected with the cold trap precipitation tank, the standard container, the thermostat, the vacuum molecular pump set and the inert gas tank.
In a preferred embodiment of the present invention, thermometers are respectively disposed on the working medium inlet, the working medium outlet, the air inlet and the air outlet of the cold trap settling tank.
In a preferred embodiment of the present invention, the heating device comprises an electric heating wire disposed on the top end inside the cold trap settling tank and a heat insulating layer laid on the top end inside the cold trap settling tank.
In a preferred embodiment of the present invention, the standard container is provided with a metal probe for controlling the amount of the working fluid of the alkali metal and a thermometer for controlling the state of the working fluid of the alkali metal.
In a preferred embodiment of the present invention, the bottom of the oven is provided with a precision balance for measuring the mass of the working medium filled in the heat pipe.
In a preferred embodiment of the present invention, the bottom of the cold trap settling tank and the standard container are provided with a first drain pipe and a second drain pipe for cleaning the residual working medium.
The utility model discloses a preferred embodiment, be provided with first ball valve, second ball valve, third ball valve, fourth ball valve, sixth ball valve, seventh ball valve, eighth ball valve, ninth ball valve, tenth ball valve and eleventh ball valve on branch road intake pipe and the branch road muffler respectively, be provided with fifth ball valve and twelfth ball valve on the working medium export of cold-trap settling tank and standard container, be provided with the thirteenth ball valve in the main road intake pipe of standard container.
Due to the adoption of the technical scheme, the beneficial effects of the utility model reside in that:
1. the utility model discloses working medium to the heat pipe fills dress equipment and has carried out the innovative design, adopts hose connection and precision balance to measure for the first time to satisfy the high accuracy that heat pipe working medium filled dress and want.
2. The utility model discloses a cold-trap sedimentation system and heat pipe fill dress headtotail, can realize small-size working medium purification and fill the demand of dress integration, simultaneously, the heat pipe fills the dress also exclusive use of system.
3. The utility model discloses a to the heat pipe evacuation back, the alkali metal working medium fills the heat pipe under gravity and pressure differential combined action, greatly improves and fills dress efficiency and reduce heterogeneous gaseous entering.
4. The utility model discloses a precision balance measures inside change of filling into the working medium quality, realization that can be easier increases heating pipe and supporting balance, realizes many heat pipes and fills the requirement of dress of high accuracy simultaneously.
5. The utility model discloses cold-trap sedimentation system and heat pipe fill dress system all are provided with the blow off pipe, can realize the washing of system.
6. The utility model discloses carry out comprehensive optimal design, realized that many, high accuracy, high-purity of heat pipe fill dress and purification purpose.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic view of the overall structure of the present invention.
Detailed Description
In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand, the present invention is further explained below.
Referring to fig. 1 to 2, the system for purifying and filling the working medium of the alkali metal heat pipe comprises a cold trap precipitation system 100, a cold trap precipitation tank 110, a heating device 120, a stainless steel wire mesh 130, a heat pipe filling system 200, a standard container 210, a heat pipe 220, a thermostat 230, a vacuum molecular pump set 300, an inert gas tank 400 and a PLC controller.
The cold trap settling tank 110 is provided with a working medium inlet 111, a working medium outlet 112, a gas inlet pipe 113, a gas outlet pipe 114, an air inlet 115 and an air outlet 116, the working medium inlet 111 of the cold trap settling tank 110 is used for putting alkali metal to be purified, and the working medium outlet 112 of the cold trap settling tank 110 is connected with the standard container 210. In this embodiment, the working medium inlet 111, the working medium outlet 112, the air inlet 115 and the air outlet 116 of the cold trap settling tank 110 are respectively provided with a thermometer 117. The bottom of the cold trap settling tank 110 is provided with a first drain pipe 118 for cleaning the remaining working medium.
The heating device 120 is disposed in the cold trap settling tank 110 for heating the alkali metal working medium, and the heating device 120 in this embodiment includes an electric heating wire 121 disposed at the top end inside the cold trap settling tank 110 and an insulating layer 122 laid on the top end inside the cold trap settling tank 110. Specifically, the top end of the cold trap settling tank 200 is a heating section for heating the alkali metal working medium in a manner of using an electric heating wire 121 and an insulating layer 122.
The stainless steel mesh 130 is filled inside the cold-trap settling tank 110, and specifically, the stainless steel mesh 130 is filled at the bottom end inside the cold-trap settling tank 110.
The standard container 210 is provided with a working medium inlet 211, a working medium outlet 212, a main path air inlet pipe 213 and a main path air outlet pipe 214, the working medium inlet 211 of the standard container 210 is connected with the working medium outlet 112 of the cold trap settling tank 110, the working medium outlet 212 of the standard container 210 is connected with the heat pipe 220 through a hose 221, and the hose 221 is connected with the working medium outlet 212 of the standard container 210 through a flexible hose. The standard container 210 in this embodiment is provided with a metal probe 215 for controlling the amount of the working fluid of the alkali metal and a thermometer 216 for controlling the state of the working fluid of the alkali metal. The bottom of the standard container 210 is provided with a second sewage draining pipe 217 for cleaning the residual working medium.
The thermostat 230 is disposed outside the heat pipe 220 and is used for heating the heat pipe 220, and the thermostat 230 can satisfy the stable temperature of 300 ℃ to satisfy the high-temperature baking degassing of the heat pipe 220. Precision balance for measuring the mass of the working medium charged in heat pipe 220 is provided at the bottom of oven 230.
The vacuum molecular pump set 300 is communicated with the cold trap precipitation tank 110 and the gas inlet pipe 113 and the main path gas inlet pipe 213 of the standard container 210 through the branch gas inlet pipe 10, and the cold trap precipitation tank 110 and the gas outlet pipe 114 and the main path gas outlet pipe 214 of the standard container 210 are connected with the vacuum molecular pump set 300 through the branch gas return pipe 20. The inert gas tank 400 is communicated with the cold trap settling tank 110 and the gas inlet pipe 113 and the main path inlet pipe 213 of the standard container 210 through a branch inlet pipe 10, and the cold trap settling tank 110 and the gas outlet pipe 114 and the main path outlet pipe 214 of the standard container 210 are connected with the inert gas tank 400 through a branch return pipe 20. A safety valve 401 is provided at a gas outlet of the inert gas tank 400. The vacuum molecular pump unit 300 and the inert gas tank 400 in this embodiment are connected to the hose 221.
The branch air inlet pipe 10 and the branch air return pipe 20 are respectively provided with a first ball valve 31, a second ball valve 32, a third ball valve 33, a fourth ball valve 34, a sixth ball valve 36, a seventh ball valve 37, an eighth ball valve 38, a ninth ball valve 39, a tenth ball valve 40 and an eleventh ball valve 41, the working medium outlet 112 of the cold trap settling tank 110 is provided with a fifth ball valve 35, the working medium outlet 212 of the standard container 210 is provided with a twelfth ball valve 42, and the main air inlet pipe 213 of the standard container 210 is provided with a thirteenth ball valve 43.
The utility model discloses a purification and filling method, including the following step:
1) and after the working medium to be purified is filled into the cold trap settling tank 110 of the cold trap settling system 100, the working medium to be purified is sealed, and at the moment, the thermotank 230 is inserted into the heat pipe 220 to be filled.
2) All ball valves are closed before the cold trap precipitation system 100 and the heat pipe charging system 200 are activated.
3) After the fourth ball valve 34, the sixth ball valve 36, the ninth ball valve 39, the tenth ball valve 40 and the thirteenth ball valve 43 are opened, the safety valve 401 on the gas outlet of the inert gas tank 400 is opened, and the cold trap settling tank 110 and the heat pipe 220 are filled with inert gas. Then, after the fourth ball valve 34, the sixth ball valve 36, the ninth ball valve 39, the tenth ball valve 40, and the thirteenth ball valve 43 are closed, the third ball valve 33, the seventh ball valve 37, and the eighth ball valve 38 are opened to start the vacuum molecular pump set 300, and the air inside is replaced repeatedly for several times, at this time, the interiors of the cold trap settling tank 110 and the heat pipe 220 are filled with inert gas for protection, and the other ball valves are in a closed state, which can be used as a check whether the sealing performance of the cold trap settling system 100 and the heat pipe filling system 200 is intact.
4) The third ball valve 33, the seventh ball valve 37, the eighth ball valve 38 are closed, and the fifth ball valve 35 is opened. The air inlet 115 of the cold trap sedimentation system 100 is filled with air, the heating device 120 on the upper part of the cold trap sedimentation tank 110 of the cold trap sedimentation system 100 is opened to melt the alkali metal working medium, the fourth ball valve 34, the sixth ball valve 36, the ninth ball valve 39, the tenth ball valve 40 and the safety valve 401 on the gas outlet of the inert gas tank 400 are opened, and the melted alkali metal working medium flows into the standard container 210 from the working medium outlet 112 of the cold trap sedimentation tank 110 under the action of air pressure to finish the purification of the alkali metal working medium. The fourth ball valve 34, the sixth ball valve 36, the ninth ball valve 39, the tenth ball valve 40 and the safety valve 401 on the gas outlet of the inert gas tank are closed.
5) And starting the constant temperature box 230 to stabilize the temperature at 300 ℃, and performing high-temperature baking degassing on the heat pipe 220. The eighth ball valve 38, the ninth ball valve 39 and the eleventh ball valve 41 are opened, and the vacuum molecular pump group 400 is started to reach a certain vacuum degree (generally required to be 1.3 multiplied by 10)-3Pa) and then closing the eighth ball valve 38, the ninth ball valve 39 and the eleventh ball valve 41, and closing the vacuum molecular pump group 400.
6) When the twelfth ball valve 42 is opened, the alkali working fluid flows into the heat pipe 220 under the action of the pressure difference and the gravity because the inside of the heat pipe 220 is at a very high negative pressure.
7) And opening the eighth ball valve 38, the ninth ball valve 39 and the thirteenth ball valve 43, vacuumizing the heat pipe 220 by using the vacuum molecular pump set 400, closing the eighth ball valve 38, the ninth ball valve 39 and the thirteenth ball valve 43 of the valves, and welding the interfaces of the heat pipe 220 to finish the filling of the working medium of the heat pipe.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. The utility model provides an alkali metal heat pipe working medium purification and fill dress system which characterized in that includes:
the cold trap sedimentation system comprises a cold trap sedimentation tank, wherein the cold trap sedimentation tank is provided with a working medium inlet for putting alkali metal to be purified, a working medium outlet connected with the standard container, a gas inlet pipe, a gas outlet pipe, an air inlet and an air outlet;
the heating device is arranged on the cold trap precipitation tank and used for heating the alkali metal working medium;
the stainless steel wire mesh is filled in the cold trap settling tank;
the heat pipe filling system comprises a standard container, wherein the standard container is provided with a working medium inlet connected with the cold trap settling tank, a working medium outlet connected with the heat pipe, a main air inlet pipe and a main air outlet pipe;
the constant temperature box is arranged outside the heat pipe and used for heating the heat pipe;
the vacuum molecular pump set is communicated with the cold trap settling tank and the gas inlet pipe and the main path gas inlet pipe of the standard container through branch gas inlet pipes, and the cold trap settling tank and the gas outlet pipe and the main path gas outlet pipe of the standard container are connected with the vacuum molecular pump set through branch gas return pipes;
the inert gas tank is used for filling inert gas and storing an alkali metal working medium, the inert gas tank is communicated with the cold trap settling tank and the gas inlet pipe and the main path gas inlet pipe of the standard container through a branch gas inlet pipe, and the cold trap settling tank is connected with the inert gas tank through a branch gas return pipe and the gas outlet pipe and the main path gas outlet pipe of the standard container;
and the PLC is respectively connected with the cold trap precipitation tank, the standard container, the thermostat, the vacuum molecular pump set and the inert gas tank.
2. The system for purifying and charging working medium of alkali metal heat pipe of claim 1, wherein thermometers are respectively disposed on the working medium inlet, the working medium outlet, the air inlet and the air outlet of the cold trap settling tank.
3. The system for purifying and charging working medium of alkali metal heat pipe as claimed in claim 1, wherein said heating device comprises an electric heating wire disposed at the top end of the interior of said cold trap settling tank and an insulating layer laid on the top end of the interior of said cold trap settling tank.
4. The system for purifying and filling working fluid of an alkali metal heat pipe as claimed in claim 1, wherein the standard container is respectively provided with a metal probe for controlling the amount of the working fluid of the alkali metal and a thermometer for controlling the state of the working fluid of the alkali metal.
5. The system for purifying and filling working medium of alkali metal heat pipe according to claim 1, wherein the bottom of said thermostat is provided with a precision balance for measuring the mass of working medium filled in said heat pipe.
6. The system for purifying and charging working medium of alkali metal heat pipe as claimed in claim 1, wherein the bottom of the cold trap settling tank and the standard container are provided with a first drain pipe and a second drain pipe for cleaning the residual working medium.
7. The system for purifying and filling working medium of alkali metal heat pipes according to claim 1, wherein the branch inlet pipe and the branch return pipe are respectively provided with a first ball valve, a second ball valve, a third ball valve, a fourth ball valve, a sixth ball valve, a seventh ball valve, an eighth ball valve, a ninth ball valve, a tenth ball valve and an eleventh ball valve, the working medium outlets of the cold trap settling tank and the standard container are provided with a fifth ball valve and a twelfth ball valve, and the main branch inlet pipe of the standard container is provided with a thirteenth ball valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021402963.1U CN212770903U (en) | 2020-07-16 | 2020-07-16 | Alkali metal heat pipe working medium purification and filling system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021402963.1U CN212770903U (en) | 2020-07-16 | 2020-07-16 | Alkali metal heat pipe working medium purification and filling system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212770903U true CN212770903U (en) | 2021-03-23 |
Family
ID=75079345
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021402963.1U Active CN212770903U (en) | 2020-07-16 | 2020-07-16 | Alkali metal heat pipe working medium purification and filling system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212770903U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115029563A (en) * | 2022-05-08 | 2022-09-09 | 华北科技学院 | High-temperature heat pipe alkali metal working medium rectification and purification device and method |
-
2020
- 2020-07-16 CN CN202021402963.1U patent/CN212770903U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115029563A (en) * | 2022-05-08 | 2022-09-09 | 华北科技学院 | High-temperature heat pipe alkali metal working medium rectification and purification device and method |
| CN115029563B (en) * | 2022-05-08 | 2024-05-17 | 华北科技学院 | High-temperature heat pipe alkali metal working medium rectifying and purifying device and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110243212B (en) | High-temperature alkali metal heat pipe hot-state filling loop system and method | |
| CN108534578A (en) | A kind of preparation method of packed bed heat-storing device and heat accumulation ball | |
| CN112410572B (en) | Melting and purifying device for liquid metal loop | |
| CN110949715B (en) | High-precision quantitative filling device and method for liquid sodium metal | |
| CN107315068B (en) | Liquid metal purification experiment loop system and application method thereof | |
| CN106769450B (en) | Fused salt environmental mechanics performance testing device, system and method | |
| CN212770903U (en) | Alkali metal heat pipe working medium purification and filling system | |
| CN110411253B (en) | High-temperature heat pipe working medium filling device and method | |
| CN108426169A (en) | A kind of hydrogen dynamical system based on heat self-balancing type solid hydrogen source reactor | |
| CN102878840B (en) | Non-oxidation split charging device and non-oxidation split charging method for manufacturing alkali-metal high-temperature heat tubes | |
| CN112285152A (en) | High-temperature heat pipe alkali metal working medium evaporation and condensation measuring system and method | |
| CN107388602B (en) | A kind of photovoltaic and photothermal integral device | |
| CN212843091U (en) | Alkali metal heat pipe working medium fills dress system | |
| CN212770902U (en) | Alkali metal heat pipe working medium purification system | |
| CN107195339B (en) | Liquid metal loop running medium melting and purifying device | |
| CN205844301U (en) | A kind of purifying molten metal experimental provision | |
| CN115957560B (en) | Filtering system applied to liquid lead bismuth alloy experimental loop | |
| CN200986336Y (en) | Pocketed heat solar transducing pipe | |
| CN111272219A (en) | Liquid metal lithium physical property parameter testing system and testing method thereof | |
| CN106813101A (en) | A kind of metal hydride hydrogen storage unit | |
| CN2101843U (en) | Heat exchang apparatus with fixed pipe type conduit module | |
| CN101089513A (en) | Thermal storage solar conversion tube | |
| CN213178841U (en) | Fluid heating device using secondary medium | |
| CN109365471A (en) | Handle the intelligent recovery system of rock core Residual Mercury | |
| CN113852300B (en) | Vapor feed type AMTEC device working medium purifying and filling device and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |