CN113280338A - Upper air inlet burner - Google Patents
Upper air inlet burner Download PDFInfo
- Publication number
- CN113280338A CN113280338A CN202110606880.7A CN202110606880A CN113280338A CN 113280338 A CN113280338 A CN 113280338A CN 202110606880 A CN202110606880 A CN 202110606880A CN 113280338 A CN113280338 A CN 113280338A
- Authority
- CN
- China
- Prior art keywords
- outer ring
- base
- inner ring
- channel
- fire cover
- 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.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
- F23D14/04—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/62—Mixing devices; Mixing tubes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C3/00—Stoves or ranges for gaseous fuels
- F24C3/08—Arrangement or mounting of burners
- F24C3/085—Arrangement or mounting of burners on ranges
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C3/00—Stoves or ranges for gaseous fuels
- F24C3/12—Arrangement or mounting of control or safety devices
- F24C3/126—Arrangement or mounting of control or safety devices on ranges
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
- F23D2900/14—Special features of gas burners
- F23D2900/14062—Special features of gas burners for cooking ranges having multiple flame rings
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Gas Burners (AREA)
Abstract
The invention relates to the field of gas cookers, in particular to an upper air inlet burner, which comprises a base, wherein the base supplies air to an outer ring fire cover through an outer ring ejector pipe and supplies air to an inner ring fire cover through an inner ejector pipe; the outer ring fire cover is arranged on the outer ring fire cover base; the inner ring fire cover is arranged on the inner ring fire cover base; the isolation baffle plate separates the secondary air channel and the primary air channel from each other up and down; the primary air channel is formed between the base and the isolation baffle and supplies primary air required by the outer ring injection pipe and the inner ring injection pipe; the secondary air channel is formed between the isolation baffle and the outer ring fire cover base and provides secondary air supply required by the combustion of the outer ring fire cover and the inner ring fire cover; the outer ring mixed gas channel is communicated with the outer ring injection pipe and directly reaches the outer ring fire cover from the base. After adopting above-mentioned scheme, can separate primary air passageway and secondary air passageway completely to the temperature when reducing the burning is to drawing the influence of penetrating the performance.
Description
Technical Field
The invention relates to the field of gas stoves, in particular to an upper air inlet burner.
Background
Because of various problems of the conventional lower air inlet burner, more and more gas cookers are beginning to adopt the upper air inlet type burner, i.e. primary air for gas mixing and secondary air required during combustion are supplemented from the upper part of the burner base.
The existing market increasingly requires a more stable upper air inlet stove with large load, high efficiency and low emission, but the existing upper air inlet burner has the problems of long time required for reaching a stable combustion state, insufficient combustion and the like because the condition of mutual interference exists between a primary air channel and a secondary air channel and an inner ring fire cover and an outer ring fire cover substantially share the same combustion chamber; and the existing gas ejector pipe occupies more space for being far away from the combustion chamber, or is too close to the combustion chamber for saving space, so that the ejection performance is influenced by high temperature.
Therefore, the inventor further studied this to develop an upper intake burner, and this case resulted therefrom.
Disclosure of Invention
The invention aims to provide an upper air inlet burner, which completely separates a primary air channel from a secondary air channel and reduces the influence of the temperature during combustion on the injection performance.
In order to achieve the purpose, the technical scheme of the invention is as follows:
an upper air inlet burner comprises
The base supplies air to the outer ring fire cover through the outer ring injection pipe and supplies air to the inner ring fire cover through the inner injection pipe;
the outer ring fire cover is arranged on the outer ring fire cover base;
the inner ring fire cover is arranged on the inner ring fire cover base;
the isolation baffle plate separates the secondary air channel and the primary air channel from each other up and down;
the primary air channel is formed between the base and the isolation baffle and supplies primary air required by the outer ring injection pipe and the inner ring injection pipe;
the secondary air channel is formed between the isolation baffle and the outer ring fire cover base and provides secondary air supply required by the combustion of the outer ring fire cover and the inner ring fire cover;
the outer ring mixed gas channel is communicated with the outer ring injection pipe and directly reaches the outer ring fire cover from the base.
After the primary air channel and the secondary air channel are separated by the isolation baffle, the mutual interference of air flow between the primary air channel and the secondary air channel can be avoided, so that the flow of air flow can be stabilized, and the stability of flame is improved; and the position of burning lies in the burner port of the inner ring fire lid and outer ring fire lid of top, therefore the heat of downward transmission need pass through a plurality of air passages and isolation barrier, just can reach and draw and penetrate pipe department, consequently can effectively reduce the influence of temperature to drawing and penetrate the performance.
Further, the base is provided with outer loop air feed passageway, and two outer loop air feed nozzles of outer loop air feed passageway are located the base inboard, and outer loop air feed nozzle respectively corresponds an outer loop and draws and penetrate the pipe.
Because the primary air channel is positioned between the base and the isolation baffle, the outer ring air supply nozzle is required to be positioned at the inner side of the base so as to finish primary mixing of air and fuel gas before the fuel gas enters the outer ring injection pipe; and the diameter of the outer ring fire cover is larger, and mixed gas can be rapidly and sufficiently conveyed to a proper position through the two outer ring injection pipes.
Further, the base is provided with inner ring air feed passageway, and two inner ring air feed nozzles of inner ring air feed passageway are located the base inboard, and inner ring air feed nozzle respectively corresponds an inner ring and draws the ejector pipe, and the inner ring draws the ejector pipe all with inner ring fire lid base intercommunication, is provided with inner ring fire lid on the inner ring fire lid base.
Because the primary air channel is positioned between the base and the isolation baffle, the inner ring air supply nozzle is required to be positioned on the inner side of the base so as to complete primary mixing of air and fuel gas before the fuel gas enters the inner ring injection pipe.
Furthermore, the outer ring air supply channel and the inner ring air supply channel are respectively arranged on two sides of the base, the outer ring air supply nozzle and the inner ring air supply nozzle are also respectively arranged on two sides of the base, and the two outer ring injection pipes are arranged in parallel and transversely arranged on the bottom surface of the base.
The outer ring air supply nozzle and the inner ring air supply nozzle are respectively arranged on two sides of the base to avoid mutual influence during primary air supply, and the outer ring fire cover needs more fuel gas, and the outer ring injection pipe is transversely arranged on the bottom surface of the base to fully mix the fuel gas and the air.
Further, the outer ring mixed gas channel comprises a lower outer ring channel and an upper outer ring channel which are of arc structures, the lower outer ring channel separates the base from the isolation baffle and is not communicated with the primary air channel; the upper outer ring channel separates the isolation baffle from the outer ring fire cover base and does not communicate with the secondary air channel.
The lower outer ring channel and the upper outer ring channel play a role in guiding gas and simultaneously play a role in supporting and isolating a primary air channel and a secondary air channel; the non-intercommunicating with the primary air channel and the secondary air channel means that the mixed gas entering from the outer injection pipe is in a relatively closed channel when passing through the lower outer ring channel and the upper outer ring channel, and does not mean that the lower outer ring channel and the upper outer ring channel are in a totally closed structure.
Furthermore, the outer ring injection pipe and the bottom surface of the base are of an integrated structure, and the inlet end of the outer ring injection pipe and the bottom surface of the base at the outer ring air supply nozzle are recessed downwards to form a groove.
The design can reduce the space occupied by the outer injection pipe as much as possible, and simultaneously can ensure that the outer injection pipe is not influenced by combustion above, and the outer ring injection pipe and the outer ring air supply nozzle are required to ensure enough primary air inflow space.
Further, the inner ring draws penetrates the pipe and is located the isolation baffle below, and it and inner ring fire lid base intercommunication, the outer lane of inner ring fire lid base and isolation baffle formula structure as an organic whole.
The isolation baffle of integral type structure can also prevent things such as the culinary art raffinate that the top dropped except playing isolated primary air passageway, secondary air passageway.
Further, the anti-dry heating device also comprises an anti-dry heating probe which is arranged on the inner ring of the inner ring fire cover.
The thermal resistor is arranged in the dry burning prevention probe, and when the detected temperature is higher than a set value, the gas is automatically cut off, so that fire caused by dry burning is prevented.
Further, the lower outer ring channel separates the primary air channel into two sections of arc inlets with different sizes, the outer ring air supply nozzle is positioned below the larger arc inlet, and the inner ring air supply nozzle is positioned on the inner side of the smaller arc inlet.
After adopting the scheme, compared with the prior art, the invention has the following advantages:
the primary air supply and the secondary air supply are not interfered with each other, so that the flow of air flow can be stabilized, and the stability of flame is increased; the base and the fire cover burning above the base are isolated in multiple layers (a primary air channel, a secondary air channel, an isolation baffle plate and the fire cover base), so that the influence of the temperature during burning on the injection performance is effectively reduced; meanwhile, the utilization rate and the combustion efficiency of the fuel gas are improved.
Drawings
FIG. 1 is one of the schematic diagrams of the present invention;
FIG. 2 is a second schematic diagram of the present invention;
FIG. 3 is a schematic view of a base;
FIG. 4 is a schematic view of an isolation baffle in cooperation with an inner ring ejector tube;
FIG. 5 is a schematic view of an isolation barrier mating base;
FIG. 6 is a schematic diagram of the gas supply of the outer ring fire cover;
FIG. 7 is a schematic illustration of the inner ring fire cover gas supply;
description of the reference symbols
A base 1, an outer ring air supply channel 11, an outer ring air supply nozzle 12, an outer ring injection pipe 13,
a lower outer ring channel 14, an inner ring air supply channel 15, an inner ring air supply nozzle 16,
an isolation baffle 2, an upper outer ring channel 21, an inner ring injection pipe 22, an inner ring fire cover base 23,
an outer ring fire cover base 3, an outer ring fire cover 4, an inner ring fire cover 5,
a primary air channel 6, a secondary air channel 7 and an anti-dry heating probe 8.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
As shown in the figure, the upper air inlet burner comprises a base 1, an isolation baffle plate and an outer ring fire cover base 1.
With reference to fig. 1 and 3, an outer ring air supply channel 11 and an inner ring air supply channel 15 are arranged below two sides of the base 1, air inlets of the outer ring air supply channel 11 and the inner ring air supply channel 15 are located outside the base 1, two outer ring air supply nozzles 12 arranged in the outer ring air supply channel 11 and two inner ring air supply nozzles 16 arranged in the inner ring air supply channel 15 are located inside the base 1, wherein the positions of the inner ring air supply nozzles 16 are relatively higher than those of the outer ring air supply nozzles 12.
The outer ring air supply nozzles 12 respectively correspond to an outer ring injection pipe 13, the two outer ring injection pipes 13 are arranged in parallel and transversely arranged on the bottom surface of the base 1, the outer ring injection pipes 13 and the bottom surface of the base 1 are of an integrated structure, namely, one part of each outer ring injection pipe 13 is positioned on the outer side of the bottom surface of the base 1, and the other part of each outer ring injection pipe 13 is positioned on the inner side of the bottom surface of the base 1; the inlet end of the outer ring injection pipe 13 and the bottom surface of the base 1 at the outer ring air supply nozzle 12 are recessed downwards to form a groove, so that enough primary air surging space is ensured at the outer ring injection pipe 13 and the outer ring air supply nozzle 12.
The inner ring air supply nozzle 16 corresponds to an inner ring injection pipe 22, the two inner ring injection pipes 22 are arranged at the bottom of the isolation baffle 2, the middle part of the isolation baffle 2 and the inner ring fire cover base 231 can be made into an integrated structure, so that the air outlet end of the inner ring injection pipe 22 can supply air to the inner ring fire cover base 231, and the inner ring fire cover base 231 is provided with the inner ring fire cover 5.
The outer loop draws the end of giving vent to anger of penetrating pipe 13 and the lower outer loop passageway 14 intercommunication of the inboard side of base 1, lower outer loop passageway 14 arranges along base 1 side arc, and plays supporting role (refer to fig. 2, fig. 5) to division baffle 2, make simultaneously and form two sections arc entrances different in size between base 1 and the division baffle 2, as primary air channel 6, outer loop air feed nozzle 12 is located great arc entrance below, inner loop air feed nozzle 16 is located less arc entrance inboard.
The lower outer ring channel 14 corresponds to the upper outer ring channel 21 above the isolation baffle 2, the upper outer ring channel 21 separates the isolation baffle 2 and the outer ring fire cover base 31 to form a secondary air channel 7 (refer to fig. 2 and 5), meanwhile, the upper outer ring channel 21 is communicated with the outer ring fire cover base 31 for air supply, and the outer ring fire cover base 31 is provided with an outer ring fire cover 4; the separation baffle 2 and the upper outer ring channel 21 may be of one-piece construction.
When the combustor works:
the air supply line of outer ring fire lid 4 does, admits air from outer ring air supply channel 11, mixes primary air in two outer ring air feed nozzle 12 departments, reentrants two outer rings and penetrates the pipe 13, penetrates the pipe 13 intensive mixing back in the outer ring, enters into the lower outer ring passageway 14 of both sides and upwards transports, and the last outer ring passageway 21 of way isolation barrier 2 enters into in outer ring fire lid base 31 and the outer ring fire lid 4, and secondary air mends from outer ring fire lid base 31 below.
The air supply line of inner ring fire lid 5 does, admits air from inner ring air supply channel 15, mixes primary air in two inner ring air feed nozzle 16 departments, draws during pipe 22 enters into inner ring fire lid base 231 and inner ring fire lid 5 through two inner rings, and the height of inner ring fire lid base 231 upwards extends from division barrier 2, can receive secondary air's supply when burning equally.
The inner ring of the inner ring fire cover 5 is also provided with an anti-dry burning probe 8, the anti-dry burning probe 8 is arranged on the base 1 in a penetrating way, and when the detected temperature is higher than a set value, the gas is automatically cut off, so that the fire caused by dry burning is prevented.
The ignition needle and the thermocouple are common parts of the combustor, the ignition groove of the outer ring fire cover 4, and the combustion holes of the inner ring fire cover 5 and the outer ring fire cover 4 are also common technical features of the combustor, and are not described in detail herein.
The product adopting the technical scheme of the invention and the upper air inlet product before improvement are tested in a laboratory to obtain the data in the tables 1 and 2.
Outstanding big thermal load combustor, the better that the mixture of gas and air is done, the burning just also is more abundant, and the cooking utensils just can produce higher thermal efficiency (the thermal efficiency is not equal to the thermal load), and its exhaust emission CO and oxynitride just also are lower (being carbon monoxide concentration in the dry flue gas of table 2), and the environmental protection performance of cooking utensils just also is higher just more, and the concrete expression does not have the peculiar smell, and the bottom of a boiler can not sooty, saves the gas, and it is fast to fry dish.
The time process is required from the cold state to the stable state of the combustor, the temperature of the whole combustor is increased, the heat load and the carbon monoxide content are greatly changed when the temperature is increased, the heat load and the carbon monoxide content are gradually reduced along with the increase of the temperature of the combustor and finally reach the stable state, therefore, whether the performance of the combustor is excellent or not can be judged, and comprehensive judgment can be carried out according to the time for the combustor to reach the stable combustion and the change of the heat load carbon monoxide concentration during the combustion.
The existing upper air inlet burner basically reaches a combustion stable state for a long time, has large changes of heat load and carbon monoxide content, and mostly needs more than 30 minutes to be basically stable in the laboratory test process.
The product adopting the technical scheme of the invention can reach a thermal stable state within 20 minutes, and the comprehensive performance index of the product is superior to that of the existing product.
Table 1:
table 2:
the above description is only an embodiment of the present invention, and all the terms such as "upper", "lower", "left", "right", "middle", etc. in the present invention are used as reference and not absolutely limited, and all the insubstantial modifications made by the present invention shall fall within the scope of infringing the present invention.
Claims (9)
1. An upper intake air burner, characterized by: comprises that
The base supplies air to the outer ring fire cover through the outer ring injection pipe and supplies air to the inner ring fire cover through the inner injection pipe;
the outer ring fire cover is arranged on the outer ring fire cover base;
the inner ring fire cover is arranged on the inner ring fire cover base;
the isolation baffle plate separates the secondary air channel and the primary air channel from each other up and down;
the primary air channel is formed between the base and the isolation baffle and supplies primary air required by the outer ring injection pipe and the inner ring injection pipe;
the secondary air channel is formed between the isolation baffle and the outer ring fire cover base and provides secondary air supply required by the combustion of the outer ring fire cover and the inner ring fire cover;
the outer ring mixed gas channel is communicated with the outer ring injection pipe and directly reaches the outer ring fire cover from the base.
2. An upper intake burner as claimed in claim 1, wherein: the base is provided with outer loop air feed channel, and two outer loop air feed nozzles of outer loop air feed channel are located the base inboard, and outer loop air feed nozzle respectively corresponds an outer loop and draws and penetrate the pipe.
3. An upper intake burner as claimed in claim 2, wherein: the base is provided with inner ring air feed passageway, and two inner ring air feed nozzles of inner ring air feed passageway are located the base inboard, and inner ring air feed nozzle respectively corresponds an inner ring and draws the ejector pipe, and the inner ring draws the ejector pipe all with inner ring fire lid base intercommunication, is provided with inner ring fire lid on the inner ring fire lid base.
4. An upper intake burner as claimed in claim 3, wherein: the outer ring air supply channel and the inner ring air supply channel are respectively arranged on two sides of the base, the outer ring air supply nozzle and the inner ring air supply nozzle are also respectively arranged on two sides of the base, and the two outer ring injection pipes are arranged in parallel and transversely arranged on the bottom surface of the base.
5. An upper intake burner as claimed in claim 2, wherein: the outer ring mixed gas channel comprises a lower outer ring channel and an upper outer ring channel which are of arc structures, the lower outer ring channel separates the base from the isolation baffle and is not communicated with the primary air channel; the upper outer ring channel separates the isolation baffle from the outer ring fire cover base and does not communicate with the secondary air channel.
6. An upper intake burner as claimed in claim 2, wherein: the outer ring draws and penetrates pipe and base bottom surface formula structure as an organic whole, and its entry end and the base bottom surface undercut of outer ring air feed nozzle department form a recess.
7. An upper intake burner as claimed in claim 2, wherein: the inner ring draws penetrates the pipe and is located the isolation barrier below, and it and inner ring fire lid base intercommunication, the outer lane and the isolation barrier formula structure as an organic whole of inner ring fire lid base.
8. An upper intake burner as claimed in claim 1, wherein: the anti-dry heating probe is arranged on the inner ring of the inner ring fire cover.
9. An upper intake burner as claimed in claim 5, wherein: the lower outer ring channel isolates the primary air channel into two sections of arc inlets with different sizes, the outer ring air supply nozzle is positioned below the larger arc inlet, and the inner ring air supply nozzle is positioned on the inner side of the smaller arc inlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110606880.7A CN113280338B (en) | 2021-06-01 | 2021-06-01 | Upper air inlet burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110606880.7A CN113280338B (en) | 2021-06-01 | 2021-06-01 | Upper air inlet burner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113280338A true CN113280338A (en) | 2021-08-20 |
| CN113280338B CN113280338B (en) | 2022-03-18 |
Family
ID=77282915
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110606880.7A Active CN113280338B (en) | 2021-06-01 | 2021-06-01 | Upper air inlet burner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113280338B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114183755A (en) * | 2021-11-23 | 2022-03-15 | 佛山市顺德区美的洗涤电器制造有限公司 | Combustion device and gas stove |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2479366Y (en) * | 2001-04-20 | 2002-02-27 | 广东美的集团股份有限公司 | Multi-nozzle burner |
| CN101446415A (en) * | 2008-12-23 | 2009-06-03 | 刘一飞 | Embedded burner of household gas cooker with multiple nozzles, high flow rate and full upward air intake |
| US20100233643A1 (en) * | 2007-10-23 | 2010-09-16 | Electrolux Home Products Corporation N.V. | Gas burner |
| CN104713083A (en) * | 2015-03-12 | 2015-06-17 | 广东美的厨房电器制造有限公司 | Burner and gas appliance |
| CN110848689A (en) * | 2018-08-20 | 2020-02-28 | 宁波方太厨具有限公司 | Upper air inlet burner |
| CN111256126A (en) * | 2018-11-30 | 2020-06-09 | 宁波方太厨具有限公司 | Burner for gas stove |
| CN112161268A (en) * | 2020-11-04 | 2021-01-01 | 宁波神力燃具有限公司 | Furnace end, combustor and gas-cooker |
-
2021
- 2021-06-01 CN CN202110606880.7A patent/CN113280338B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2479366Y (en) * | 2001-04-20 | 2002-02-27 | 广东美的集团股份有限公司 | Multi-nozzle burner |
| US20100233643A1 (en) * | 2007-10-23 | 2010-09-16 | Electrolux Home Products Corporation N.V. | Gas burner |
| CN101446415A (en) * | 2008-12-23 | 2009-06-03 | 刘一飞 | Embedded burner of household gas cooker with multiple nozzles, high flow rate and full upward air intake |
| CN104713083A (en) * | 2015-03-12 | 2015-06-17 | 广东美的厨房电器制造有限公司 | Burner and gas appliance |
| CN110848689A (en) * | 2018-08-20 | 2020-02-28 | 宁波方太厨具有限公司 | Upper air inlet burner |
| CN111256126A (en) * | 2018-11-30 | 2020-06-09 | 宁波方太厨具有限公司 | Burner for gas stove |
| CN112161268A (en) * | 2020-11-04 | 2021-01-01 | 宁波神力燃具有限公司 | Furnace end, combustor and gas-cooker |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114183755A (en) * | 2021-11-23 | 2022-03-15 | 佛山市顺德区美的洗涤电器制造有限公司 | Combustion device and gas stove |
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| Publication number | Publication date |
|---|---|
| CN113280338B (en) | 2022-03-18 |
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