CN105597653A - Sealed continuous reaction type grease alkali refining device - Google Patents
Sealed continuous reaction type grease alkali refining device Download PDFInfo
- Publication number
- CN105597653A CN105597653A CN201610212035.0A CN201610212035A CN105597653A CN 105597653 A CN105597653 A CN 105597653A CN 201610212035 A CN201610212035 A CN 201610212035A CN 105597653 A CN105597653 A CN 105597653A
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- Prior art keywords
- tank
- alkali refining
- airtight
- pot
- reaction
- Prior art date
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- 238000009874 alkali refining Methods 0.000 title claims abstract description 39
- 239000004519 grease Substances 0.000 title abstract description 6
- 238000006757 chemical reactions by type Methods 0.000 title abstract 5
- 238000006243 chemical reaction Methods 0.000 claims abstract description 64
- 238000003756 stirring Methods 0.000 claims abstract description 12
- 239000011261 inert gas Substances 0.000 claims description 20
- 239000000463 material Substances 0.000 claims description 17
- 241000143392 Oar Species 0.000 claims description 11
- 230000035484 reaction time Effects 0.000 abstract description 30
- 238000007599 discharging Methods 0.000 abstract description 11
- 230000000694 effects Effects 0.000 abstract description 7
- 230000000875 corresponding Effects 0.000 abstract description 4
- 239000007788 liquid Substances 0.000 abstract description 4
- 239000003921 oil Substances 0.000 description 26
- 235000019198 oils Nutrition 0.000 description 26
- 239000000376 reactant Substances 0.000 description 10
- 239000002585 base Substances 0.000 description 4
- 230000001105 regulatory Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000010924 continuous production Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 235000015112 vegetable and seed oil Nutrition 0.000 description 2
- 239000008158 vegetable oil Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/18—Stationary reactors having moving elements inside
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0006—Controlling or regulating processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0053—Details of the reactor
- B01J19/006—Baffles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0053—Details of the reactor
- B01J19/0066—Stirrers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0053—Details of the reactor
- B01J19/0073—Sealings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/14—Production of inert gas mixtures; Use of inert gases in general
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11B—PRODUCING, e.g. BY PRESSING RAW MATERIALS OR BY EXTRACTION FROM WASTE MATERIALS, REFINING OR PRESERVING FATS, FATTY SUBSTANCES, e.g. LANOLIN, FATTY OILS OR WAXES; ESSENTIAL OILS; PERFUMES
- C11B3/00—Refining fats or fatty oils
- C11B3/02—Refining fats or fatty oils by chemical reaction
- C11B3/06—Refining fats or fatty oils by chemical reaction with bases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/00049—Controlling or regulating processes
- B01J2219/00164—Controlling or regulating processes controlling the flow
- B01J2219/00166—Controlling or regulating processes controlling the flow controlling the residence time inside the reactor vessel
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/00049—Controlling or regulating processes
- B01J2219/00182—Controlling or regulating processes controlling the level of reactants in the reactor vessel
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/00761—Details of the reactor
- B01J2219/00763—Baffles
- B01J2219/00765—Baffles attached to the reactor wall
- B01J2219/00777—Baffles attached to the reactor wall horizontal
Abstract
The invention discloses a sealed continuous reaction type grease alkali refining device. The sealed continuous reaction type grease alkali refining device comprises a pot body, wherein a feeding valve is arranged at the bottom of the pot body; a plurality of discharging valves are arranged on a side wall of the pot body; the discharging valves are connected with a discharging pipeline arranged at the upper side of the pot body through pipelines; the pot body is internally provided with stirring shafts driven by a motor; the stirring paddles are arranged on the stirring shaft. According to the sealed continuous reaction type grease alkali refining device disclosed by the invention, a mixed reaction solution meeting conditions enters the pot body from a pipeline controlled by the feeding valve at the bottom of the pot body at a pre-set flow speed, and the mixed reaction solution reacts for certain time under the stirring effect of the stirring paddles driven by the stirring shaft; the height of the reaction solution in the pot body when reaction time is met is obtained according to time needed by the reaction and a flow speed, and the closest discharging valve is selected to carry out discharging (the other discharging valves are switched off) when the liquid surface of the mixed reaction solution reaches the corresponding height, so that the accurate regulation and control of the reaction time can be realized; the sealed continuous reaction type grease alkali refining device has the advantages that air can be separated and the utilization rate of the pot body is up to be 100%.
Description
Technical field
The present invention relates to oil alkali refining technical field, be specifically related to a kind of airtight successive reaction oil alkali refining device that can timing.
Background technology
Oil alkali refining, refers to the free fatty in alkali and in sample, and a kind of method of refining of while other impurity of remove portion. Alkali refining tank for oil is production equipment important in oil and fat refining process. At present, airtight continuous alkali-refining equipment is mainly divided into 2 types, the first: bottom in and top out type, and this kind equipment has with air isolated, the advantage of tank body utilization rate 100%, but there is nonadjustable shortcoming of reaction time in it; The second, upper entering and lower leaving type, this kind of equipment has advantages of that the reaction time is adjustable, but to have tank body utilization rate be only 75% for it, and can not completely cut off the shortcoming of air. Therefore, be badly in need of design one class and have that isolated air, tank body utilization rate are high, regulatable oil alkali refining device of reaction time concurrently.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art or defect, the object of the present invention is to provide a kind of reaction time can regulate and control, can completely cut off air and tank body utilization rate up to 100% airtight successive reaction oil alkali refining device.
The present invention realizes by following technical solution:
A kind of airtight successive reaction oil alkali refining device, comprises tank body, and tank base offers material inlet valve, offers multiple discharge valves on the sidewall of tank body, and discharge valve is connected with the discharge pipe of being located at tank body top by pipeline; In tank body, be provided with by motor-driven shaft, on shaft, be provided with stirrer paddle.
The operation principle of airtight successive reaction oil alkali refining device of the present invention is: the mixed reaction solution satisfying condition is entered to tank body with the flow velocity of setting from the pipeline of the material inlet valve control of tank base, under the stirring action of the stirrer paddle being driven by shaft, react certain hour, the height of reactant liquor in tank body while being met the reaction time according to reaction required time and flow velocity, or the height of reactant liquor in tank body and reaction required time obtain mixed reaction solution and enter by material inlet valve the flow velocity (controlling feed rate in quantity-produced situation at the uniform velocity not affecting) of tank body when meeting the reaction time, realization regulated and controled accurately to the reaction time, in the time that reaching corresponding height, the liquid level of mixed reaction solution select immediate discharge valve to carry out discharging (other discharge valves keep closing), can realize continuous production, wherein, discharge valve from down to up meets reaction time needs from short to long successively.
Wherein, described tank body is cylinder, and its radius is r(m), the flow velocity that the mixed reaction solution satisfying condition enters tank body by material inlet valve is v(L/min), reaction required time is t(min), the height h=vt/ π r of reactant liquor in tank body while meeting the reaction time2; Or the height of reactant liquor discharge valve of discharging in tank body is h(m while meeting the reaction time), reaction required time is t(min), control mixed reaction solution and enter by material inlet valve the flow velocity v=π r of tank body2h/t。
In addition, inhomogeneous in order to prevent that described airtight successive reaction oil alkali refining device oil sample in grease alkali refining technology from mixing, in inner tank wall, be also provided with dividing plate.
Preferably, the top of described tank body is also provided with inert gas valve, and inert gas valve gate open piping is connected with air accumulator. When described inert gas valve being opened when being filled with inert gas in tank body, make the height of inert gas in tank body keep exceeding the height of discharge valve, further ensure that mixed reaction solution and air completely cut off.
Wherein, the stirrer paddle arranging on described shaft is selected from one or more in flat oar formula stirrer paddle, oblique leaf formula stirrer paddle, screw mixing blade.
If the required reaction time of mixed reaction solution more in short-term, can reach the effect that increases tank body top hybrid reaction fluid-in-flux by following three kinds of modes: (1), by the discharge valve of tank wall top is opened slightly, can make top mixed reaction solution slowly discharge; (2) by the pipeline by inert gas valve gate control, in tank body, be filled with appropriate inert gas, the amount of being filled with is on top, discharge nozzle road junction; (3) except regulating by discharge valve or inert gas valve, also can divide and be set to oblique leaf formula stirrer paddle or screw mixing blade by shaft top, bottom is divided and is set to flat oar formula stirrer paddle, to reach the effect that increases tank body top hybrid reaction fluid-in-flux, thereby regulate and control better the reaction time.
Wherein, described discharge valve is arranged in parallel on tank wall, and spacing distance is equal, and discharge valve from down to up meets reaction time needs from short to long successively.
Wherein, described motor is arranged on tank body top, and the gauge tap of motor draws to get off by connecting line; The gauge tap of described motor at least comprises and cut-offs switch and speed switch.
Compared with prior art, the present invention has following beneficial effect:
1) airtight successive reaction oil alkali refining device of the present invention, by the mixed reaction solution satisfying condition is entered to tank body with the flow velocity of setting from the pipeline of the material inlet valve control of tank base, under the stirring action of the stirrer paddle being driven by shaft, react certain hour, the height of reactant liquor in tank body while being met the reaction time according to reaction required time and flow velocity, or the height of reactant liquor in tank body and reaction required time obtain mixed reaction solution and enter by material inlet valve the flow velocity of tank body when meeting the reaction time, in the time that reaching corresponding height, the liquid level of mixed reaction solution select immediate discharge valve to carry out discharging (other discharge valves keep closing), realization regulated and controled accurately to the reaction time.
2) form of airtight successive reaction oil alkali refining device employing bottom in and top out of the present invention, and reacting tank body is closed type, can completely cut off air and tank body utilization rate up to 100%; When tank body utilization rate is up to 100% time, can improve stirrer paddle utilization rate simultaneously.
3) airtight successive reaction oil alkali refining device of the present invention is provided with inert gas valve, when this inert gas valve being opened when being filled with inert gas in tank body, make the height of inert gas in tank body keep exceeding the height of discharge valve, further ensured that mixed reaction solution and air are isolated.
4) airtight successive reaction oil alkali refining device of the present invention divides shaft top to be set to oblique leaf formula stirrer paddle or screw mixing blade, bottom is divided and is set to flat oar formula stirrer paddle, to reach the effect that increases tank body top hybrid reaction fluid-in-flux, thereby regulate and control better the reaction time.
Brief description of the drawings
Fig. 1 is the structural representation of the airtight successive reaction oil alkali refining of the present invention device;
In Fig. 1: 1, tank body, 2, shaft, 3, flat oar formula stirrer paddle, 4, dividing plate, 5, stirring motor, 6, material inlet valve, 7, inert gas valve, 8, discharge valve.
Fig. 2 is the structural representation of the another kind of airtight successive reaction oil alkali refining device of the present invention;
In Fig. 2: 1, tank body, 2, shaft, 3, flat oar formula stirrer paddle, 4, screw mixing blade or oblique leaf formula stirrer paddle, 5, dividing plate, 6, stirring motor, 7, material inlet valve, 8, discharge valve.
Detailed description of the invention
Further illustrate the present invention below by detailed description of the invention, following examples are preferably embodiment of the present invention, but embodiments of the present invention are not subject to the restriction of following embodiment.
Embodiment 1
As shown in Figure 1, a kind of airtight successive reaction oil alkali refining device, comprises airtight tank body 1, and tank body 1 bottom offers material inlet valve 6, on the sidewall of tank body 1, offer multiple discharge valves 8, discharge valve 8 is connected with the discharge pipe of being located at tank body 1 top by pipeline; In tank body 1, be provided with the shaft 2 being driven by motor 5, on shaft 2, be provided with stirrer paddle 3;
Described discharge valve 8 is arranged in parallel on tank body 1 sidewall, and spacing distance is equal, and discharge valve from down to up meets reaction time needs from short to long successively;
Described motor 5 is arranged on tank body 1 top, at least comprises that the gauge tap of the motor 5 that cut-offs switch and speed switch draws to get off by connecting line;
On described shaft 2, part and lower part are all set to flat oar formula stirrer paddle 3;
On described tank body 1 inwall, be also provided with the dividing plate 4 that opposing parallel arranges;
The top of described tank body 1 is also provided with inert gas valve 7, and inert gas valve 7 is connected with air accumulator by pipeline; When described inert gas valve being opened when being filled with inert gas in tank body, make the height of inert gas in tank body keep exceeding the height of discharge valve, further ensure that the mixed reaction solution in tank body and air completely cut off.
The operation principle of airtight successive reaction oil alkali refining device of the present invention is: the mixed reaction solution satisfying condition is entered to tank body with the flow velocity of setting from the pipeline of the material inlet valve control of tank base, under the stirring action of the stirrer paddle being driven by shaft, react certain hour, the height of reactant liquor in tank body while being met the reaction time according to reaction required time and flow velocity, or the height of reactant liquor in tank body and reaction required time obtain mixed reaction solution and enter by material inlet valve the flow velocity (controlling feed rate in quantity-produced situation at the uniform velocity not affecting) of tank body when meeting the reaction time, realization regulated and controled accurately to the reaction time, in the time that reaching corresponding height, the liquid level of mixed reaction solution select immediate discharge valve to carry out discharging (other discharge valves keep closing), can realize continuous production, wherein, discharge valve from down to up meets reaction time needs from short to long successively.
Wherein, described tank body is cylinder, and its radius is r(m), the flow velocity that the mixed reaction solution satisfying condition enters tank body by material inlet valve is v(L/min), reaction required time is t(min), the height h=vt/ π r of reactant liquor in tank body while meeting the reaction time2; Or the height of reactant liquor discharge valve of discharging in tank body is h(m while meeting the reaction time), reaction required time is t(min), control mixed reaction solution and enter by material inlet valve the flow velocity v=π r of tank body2h/t。
Embodiment 2
As shown in Figure 2, a kind of airtight successive reaction oil alkali refining device, comprises airtight tank body 1, and tank body 1 bottom offers material inlet valve 6, on the sidewall of tank body 1, offer multiple discharge valves 8, discharge valve 8 is connected with the discharge pipe of being located at tank body 1 top by pipeline; In tank body 1, be provided with the shaft 2 being driven by motor 5, on shaft 2, be provided with stirrer paddle 3;
When reaction time of described airtight successive reaction oil alkali refining device oil alkali refining in vegetable oil fine sweetening process more in short-term, described shaft 2 tops are divided and are set to screw mixing blade, bottom is divided and is set to flat oar formula stirrer paddle, the other the same as in Example 1, to reach the effect that increases tank body top hybrid reaction fluid-in-flux, thereby regulate and control better the reaction time.
Embodiment 3
A kind of airtight successive reaction oil alkali refining device, comprises airtight tank body 1, and tank body 1 bottom offers material inlet valve 6, offers multiple discharge valves 8 on the sidewall of tank body 1, and discharge valve 8 is connected with the discharge pipe of being located at tank body 1 top by pipeline; In tank body 1, be provided with the shaft 2 being driven by motor 5, on shaft 2, be provided with stirrer paddle 3;
When reaction time of described airtight successive reaction oil alkali refining device oil alkali refining in vegetable oil fine sweetening process more in short-term, described shaft 2 tops are divided and are set to oblique leaf formula stirrer paddle, bottom is divided and is set to flat oar formula stirrer paddle, the other the same as in Example 2, to reach the effect that increases tank body top hybrid reaction fluid-in-flux, thereby regulate and control better the reaction time.
Claims (8)
1. an airtight successive reaction oil alkali refining device, comprise tank body (1), it is characterized in that, tank body (1) bottom offers material inlet valve (6), on the sidewall of tank body (1), offer multiple discharge valves (8), discharge valve (8) is connected with the discharge pipe of being located at tank body (1) top by pipeline; In tank body (1), be provided with the shaft (2) being driven by motor (5), on shaft (2), be provided with stirrer paddle (3).
2. airtight successive reaction oil alkali refining device according to claim 1, is characterized in that, on described tank body (1) inwall, is also provided with dividing plate (4).
3. airtight successive reaction oil alkali refining device according to claim 2, is characterized in that, described dividing plate (4) opposing parallel setting.
4. airtight successive reaction oil alkali refining device according to claim 1, is characterized in that, the top of described tank body (1) is also provided with inert gas valve (7), and inert gas valve (7) is connected with air accumulator by pipeline.
5. airtight successive reaction oil alkali refining device according to claim 1, is characterized in that, the upper stirrer paddle (3) arranging of described shaft (2) is selected from one or more in flat oar formula stirrer paddle, oblique leaf formula stirrer paddle, screw mixing blade.
6. airtight successive reaction oil alkali refining device according to claim 1 or 5, it is characterized in that, one or more that are set in flat oar formula stirring blade, tiltedly leaf formula stirrer paddle or screw mixing blade are divided on described shaft (2) top, and described shaft (2) bottom is divided and is set to flat oar formula stirrer paddle.
7. airtight successive reaction oil alkali refining device according to claim 1, is characterized in that, described discharge valve (8) is arranged in parallel on tank body (1) sidewall, and spacing distance equates.
8. airtight successive reaction oil alkali refining device according to claim 1, is characterized in that, described motor (5) is arranged on tank body (1) top, and the gauge tap of motor (5) draws to get off by connecting line; The gauge tap of described motor (5) at least comprises and cut-offs switch and speed switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610212035.0A CN105597653B (en) | 2016-04-07 | 2016-04-07 | A kind of closed successive reaction oil alkali refining device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610212035.0A CN105597653B (en) | 2016-04-07 | 2016-04-07 | A kind of closed successive reaction oil alkali refining device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105597653A true CN105597653A (en) | 2016-05-25 |
| CN105597653B CN105597653B (en) | 2018-05-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610212035.0A Active CN105597653B (en) | 2016-04-07 | 2016-04-07 | A kind of closed successive reaction oil alkali refining device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105597653B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050077659A1 (en) * | 2002-02-25 | 2005-04-14 | Young-Nam Kim | Nano-powder extraction apparatus using a hollow impeller |
| CN103785341A (en) * | 2014-01-24 | 2014-05-14 | 广州市凯闻食品发展有限公司 | High-efficiency mixed continuous transesterification reactor |
| CN204841691U (en) * | 2015-08-11 | 2015-12-09 | 杨河峰 | Chemical industry reaction unit |
| CN205517751U (en) * | 2016-04-07 | 2016-08-31 | 广东卓原新材料科技有限公司 | Airtight consecutive reaction grease alkali refining device |
-
2016
- 2016-04-07 CN CN201610212035.0A patent/CN105597653B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050077659A1 (en) * | 2002-02-25 | 2005-04-14 | Young-Nam Kim | Nano-powder extraction apparatus using a hollow impeller |
| CN103785341A (en) * | 2014-01-24 | 2014-05-14 | 广州市凯闻食品发展有限公司 | High-efficiency mixed continuous transesterification reactor |
| CN204841691U (en) * | 2015-08-11 | 2015-12-09 | 杨河峰 | Chemical industry reaction unit |
| CN205517751U (en) * | 2016-04-07 | 2016-08-31 | 广东卓原新材料科技有限公司 | Airtight consecutive reaction grease alkali refining device |
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| Publication number | Publication date |
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| CN105597653B (en) | 2018-05-08 |
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Inventor after: Liu Qiang Inventor after: Huang Fei Inventor after: Chen Bin Inventor after: Wan Yi Inventor after: Li Huaqiang Inventor after: Yang Yu Inventor before: Li Huaqiang Inventor before: Liu Qiang Inventor before: Wan Yi Inventor before: Huang Fei Inventor before: Yang Yu Inventor before: Chen Bin |
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