CN204438119U - Gas burner - Google Patents
Gas burner Download PDFInfo
- Publication number
- CN204438119U CN204438119U CN201520023562.8U CN201520023562U CN204438119U CN 204438119 U CN204438119 U CN 204438119U CN 201520023562 U CN201520023562 U CN 201520023562U CN 204438119 U CN204438119 U CN 204438119U
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- Prior art keywords
- burning
- passage
- snare
- gas
- communicated
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- 238000010943 off-gassing Methods 0.000 claims abstract description 40
- 239000007789 gas Substances 0.000 abstract description 58
- 239000000567 combustion gas Substances 0.000 abstract description 17
- 238000002485 combustion reaction Methods 0.000 abstract description 9
- 238000010304 firing Methods 0.000 abstract description 5
- 230000035939 shock Effects 0.000 abstract description 4
- 239000002737 fuel gas Substances 0.000 description 4
- 230000003116 impacting effect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000010411 cooking Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000005496 tempering Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000013410 fast food Nutrition 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Landscapes
- Gas Burners (AREA)
Abstract
The utility model discloses a kind of gas burner, comprise mixing chamber housing and cover plate assembly, the interior zone of mixing chamber housing forms premix chamber; The base that cover plate assembly comprises and burning snare, base offers multiple first passage, multiple second passage is offered in burning snare, the inwall of burning snare offers the outgassing groove arranged along burning snare circumference, outgassing groove is that multiple and along burning snare axial direction is intervally arranged, and each second passage and multiple outgassing groove conducting.Air in air intake pipe and the combustion gas in gas inlet pipe carry out premix in premix chamber, flow in the second passage after premix through the first passage, then are flowed out for gas firing by outgassing groove.So, the air-flow in same second passage flows out from multiple outgassing groove respectively, and airflow direction flows out along burning snare side by upwards changing to, and the noise produced when effectively reducing gas shock burning, reduces noise pollution during burning, sufficient combustion.
Description
Technical field
The utility model relates to gas-cooker field, especially, relates to a kind of gas burner.
Background technology
Burner is a kind of equipment material being converted into heat energy by this chemical reaction of burning, and burner comprises oil burner and gas burner.Wherein, gas burner is a kind of heat energy apparatus utilizing air and combustion gas to burn by proper proportion, is widely used in the oil ranges such as machine-operated school lunch service, hotel, fast food restaurant or hotel.
Traditional gas burner burns upwards spraying from the surface of the cover plate that burns with the mixed combustion gas of air, and airflow direction is single, and the noise produced when impacting burning is large, causes noise pollution when burning serious.
Utility model content
The utility model provides a kind of gas burner, single with the airflow direction solving existing gas burner, and the noise produced when impacting burning is large, causes the technical problem that noise pollution when burning is serious.
The technical solution adopted in the utility model is as follows:
A kind of gas burner, comprising:
Mixing chamber housing, the interior zone of mixing chamber housing forms the premix chamber being communicated with air intake pipe and gas inlet pipe;
Cover plate assembly, comprise the base be arranged on mixing chamber housing and the burning snare be arranged on base, base offers multiple the first passage be communicated with premix chamber, multiple the second passage be communicated with the first passage is offered in burning snare, the inwall of burning snare offers the outgassing groove arranged along burning snare circumference, outgassing groove is that multiple and along burning snare axial direction is intervally arranged, and each second passage and multiple outgassing groove conducting.
Further, outgassing groove is cannelure, and spacing between adjacent outgassing groove is equal.
Further, demarcation strip is provided with in mixing chamber housing, premix chamber is the first premix chamber be communicated with air intake pipe and gas inlet pipe through divides, and the second premix chamber to be communicated with the first passage, demarcation strip offers the through hole for being communicated with the first premix chamber and the second premix chamber.
Further, the second premix chamber is less than the sectional area in exit at the sectional area of porch.
Further, burning snare and the 3rd premix chamber be formed between base for being communicated with the first passage and the second passage.
Further, be provided with flow distribution plate in mixing chamber housing, the bottom of flow distribution plate offers multiple fresh air inlet for being communicated with air intake pipe and premix chamber, and the sidewall of flow distribution plate offers multiple air admission hole for being communicated with gas inlet pipe and premix chamber.
Further, the bottom of mixing chamber housing is provided with air intake interface, and air intake interface offers the air inlet being communicated with air intake pipe and fresh air inlet, and air inlet inwall is formed with the screw thread for being connected with air intake pipe.
Further, base is formed with igniting face, first passage around igniting face outer circumference to setting, gas burner also comprises Chang Minghuo bar, the through base of Chang Minghuo bar, one end is arranged on igniting face, and the other end extends to the outside of flow distribution plate bottom and is positioned at air inlet, the sidewall of Chang Minghuo bar is communicated with gas supply pipe, and the inlet end of gas supply pipe extends to the outside of mixing chamber housing sidewall.
Further, gas burner also comprises electronic ignition lever, and electronic ignition lever runs through base, and one end extends on igniting face, and the other end extends to the outside of mixing chamber housing sidewall.
Further, gas burner also comprises burner hearth body, the sidewall of mixing chamber housing has extended radially outward mounting edge, mixing chamber housing is installed on burner hearth body bottom through mounting edge, cover plate assembly is positioned at burner hearth body, and the top of burning snare is formed with the step for locating with burner hearth body fits.
The utility model has following beneficial effect:
The utility model gas burner, the premix chamber that mixing chamber housing is formed all is communicated with air intake pipe and gas inlet pipe, the air in air intake pipe and the combustion gas in gas inlet pipe is made to carry out premix in premix chamber, air after premix and combustion gas flow in the second passage through the first passage, then are flowed out for gas firing by outgassing groove.So, the setting of outgassing groove, air-flow in same second passage is flowed out from multiple outgassing groove respectively, outgassing groove is shunted the air-flow in each second passage, and airflow direction flows out along burning snare side by upwards changing to, the noise produced when effectively reducing gas shock burning, reduces noise pollution during burning, sufficient combustion.
Except object described above, feature and advantage, the utility model also has other object, feature and advantage.Below with reference to figure, the utility model is described in further detail.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide further understanding of the present utility model, and schematic description and description of the present utility model, for explaining the utility model, is not formed improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the structural representation of the utility model preferred embodiment gas burner.
Description of reference numerals:
10, mixing chamber housing; 110, premix chamber; 112, the first premix chamber; 114, the second premix chamber; 120, demarcation strip; 122, through hole; 130, mounting edge;
20, cover plate assembly; 210, base; 212, the first passage; 214, igniting face; 220, burn snare; 222, the second passage; 224, outgassing groove; 226, step; 230, the 3rd premix chamber;
30, gas inlet pipe; 40, flow distribution plate; 410, fresh air inlet; 420, air admission hole;
50, air intake interface; 510, air inlet;
60, Chang Minghuo bar; 610, gas supply pipe; 620, Chang Minghuo cap; 70, electronic ignition lever.
Detailed description of the invention
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in detail, but the multitude of different ways that the utility model can be defined by the claims and cover is implemented.
With reference to Fig. 1, preferred embodiment of the present utility model provides a kind of gas burner, comprise mixing chamber housing 10 and cover plate assembly 20, the interior zone of mixing chamber housing 10 forms the premix chamber 110 being communicated with air intake pipe and gas inlet pipe 30, cover plate assembly 20 comprises the base 210 be arranged on mixing chamber housing 10 and the burning snare 220 be arranged on base 210, base 210 offers multiple the first passage 212 be communicated with premix chamber 110, multiple the second passage 222 be communicated with the first passage 212 is offered in burning snare 220, the inwall of burning snare 220 offers the outgassing groove 224 arranged along burning snare 220 circumference, outgassing groove 224 is that multiple and along burning snare 220 axial direction is intervally arranged, each the second passage 222 and the conducting of multiple outgassing groove 224.During the work of the present embodiment gas burner, air intake pipe connects air blast, air constantly imports in premix chamber 110 under the effect of air blast, the fuel (as natural gas) of gaseous state imports in premix chamber 110 by gas inlet pipe 30, the air in air intake pipe and the combustion gas in gas inlet pipe 30 is made to carry out premix in premix chamber 110, air after premix and combustion gas flow in the second passage 222 through the first passage 212, then are flowed out for gas firing by outgassing groove 224.So, the setting of outgassing groove 224, air-flow in same second passage 222 is flowed out from multiple outgassing groove 224 respectively, air-flow namely in each second passage 222 all can carry out shunting through multiple outgassing groove 224 and flow out, and airflow direction flows out along burning snare 220 side by upwards changing to, the noise produced when effectively reducing gas shock burning, reduces noise pollution during burning, sufficient combustion, result of use is good.In addition, the inwall of burning snare 220 coordinates with base 210 also can form territory, flame-stabilizing area, to assemble the heat of combustion flame, improves the utilization rate of fuel gas calorie.
Consult Fig. 1, in the preferred embodiment, alternatively, outgassing groove 224 can adopt cannelure, and spacing between adjacent outgassing groove 224 is equal.So, effectively ensure the uniformity of the air-flow flowed out through outgassing groove 224, reduce noise pollution, impel effluent air can form uniform combustion front, improve heat utilization rate.Alternatively, for improving the uniformity of air-flow further, reduce noise pollution, the second passage 222 is around the circumferential uniform intervals arrangement of burning snare 220.Specific in the present embodiment, outgassing groove 224 is mutually vertical with the second passage 222, the airflow direction of the second passage 222 is radial, the air-flow of outgassing groove 224 is reversed longitudinal direction, the inwall of burning snare 220 offers 10 equally distributed second passages 222 of outgassing groove 224,35 of evenly arranging altogether.In other embodiments, the quantity of outgassing groove 224 and the second passage 222 also can be other numerical value.
Consult Fig. 1, in the preferred embodiment, alternatively, demarcation strip 120 is provided with in mixing chamber housing 10, premix chamber 110 is divided into the first premix chamber 112 be communicated with air intake pipe and gas inlet pipe 30 through demarcation strip 120, and the second premix chamber 114 to be communicated with the first passage 212, demarcation strip 120 offers the through hole 122 for being communicated with the first premix chamber 112 and the second premix chamber 114.So, combustion gas in air in air intake pipe and gas inlet pipe 30 is introduced in the first premix chamber 112 and completes first time premix, entered in the second premix chamber 114 by the through hole 122 of demarcation strip 120 again and complete second time premix, making combustion gas and air in premix chamber 110, carry out secondary premix is discharged so that for gas firing again by the first passage 212, mixing fully, effective guarantee combustion gas Thorough combustion, improves the utilization rate of fuel gas calorie.Alternatively, the second premix chamber 114 is less than the sectional area in exit at the sectional area of porch.So, the passage in the gas flow second premix chamber 114 in the first premix chamber 112 can narrow, to carry out throttling to the gas entering the second premix chamber 114 through the first premix chamber 112, make from after the gas in the first premix chamber 112 enters in the second premix chamber 114, gas pressure reduces, and effectively reduces noise when impacting burning.Particularly, the noise in combustion process can reach 75 decibels and following, and more national criteria for noise 85 decibels is low.And the draught head in the first premix chamber 112 and the second premix chamber 114, the interior and above gas in the second premix chamber 114 can not be back in the first premix chamber 112, effectively prevent tempering, ensure use safety.
Consult Fig. 1, in the preferred embodiment, alternatively, burning snare 220 and the 3rd premix chamber 230 be formed between base 210 for being communicated with the first passage 212 and the second passage 222.So, entered in the 3rd premix chamber 230 by the first passage 212 after air and combustion gas carry out premix in premix chamber 110 and again carry out premix, then entered by the second passage 222 and flow out to outgassing groove 224, mix more abundant, effective guarantee combustion gas Thorough combustion, improves the utilization rate of fuel gas calorie.
Consult Fig. 1, in the preferred embodiment, alternatively, flow distribution plate 40 is provided with in mixing chamber housing 10, the bottom of flow distribution plate 40 offers multiple fresh air inlet 410 for being communicated with air intake pipe and premix chamber 110, and the sidewall of flow distribution plate 40 offers multiple air admission hole 420 for being communicated with gas inlet pipe 30 and premix chamber 110.So, the air in air intake pipe enters premix chamber 110 through fresh air inlet 410, and the combustion gas in gas inlet pipe 30 enters premix chamber 110 through air admission hole 420, realizes the object that air mixes in premix chamber 110 with combustion gas.Alternatively, for promoting fully mixing of air and combustion gas, air admission hole 420 is intervally arranged along the sidewall circumference of flow distribution plate 40, and fresh air inlet 410 is intervally arranged along flow distribution plate 40 bottom outer-edge circumference.Alternatively, the bottom of mixing chamber housing 10 is provided with air intake interface 50, air intake interface 50 offers the air inlet 510 being communicated with air intake pipe and fresh air inlet 410, air inlet 510 inwall is formed with the screw thread for being connected with air intake pipe, so that air intake pipe is threaded with air intake interface 50, connect fastening, operation is convenient.In the present embodiment, the outer wall of air intake interface 50 can adopt with the inwall of mixing chamber housing 10 and be threaded, to realize the object that air intake interface 50 is arranged at mixing chamber housing 10.In other embodiments, air intake interface 50 also can be other with the connected mode of mixing chamber housing 10.
Consult Fig. 1, in the preferred embodiment, alternatively, for improving the ignition operation of gas burner, base 210 is formed with igniting face 214, first passage 212 around igniting face 214 outer circumference to setting, gas burner also comprises Chang Minghuo bar 60, the through base 210 of Chang Minghuo bar 60, one end is arranged on igniting face 214, the other end extends to the outside of flow distribution plate 40 bottom and is positioned at air inlet 510, the sidewall of Chang Minghuo bar 60 is communicated with gas supply pipe 610, the inlet end of gas supply pipe 610 extends to the outside of mixing chamber housing 10 sidewall, to be connected with supplying gaseous fuel device.Chang Minghuo bar 60 is positioned at one end continuous burning under the air feed of gas supply pipe 610 in igniting face 214, is convenient to the cooking or heating etc. carried out on cooking stove repeatedly.The other end of Chang Minghuo bar 60 extends in air inlet 510, thus air can be blown in Chang Minghuo bar 60, effectively prevents the fuel gas return-flow generation tempering in Chang Minghuo bar 60, improves the security used.Alternatively, for improving the security of use further, the sidewall that Chang Minghuo bar 60 one end be arranged on igniting face 214 is covered with Chang Minghuo cap 620, Chang Minghuo cap 620 offers pore, thus flame can be sprayed by the side of pore from normal naked light cap 620.Alternatively, the end of Chang Minghuo bar 60 can be provided with locking nut, and to lock base 210, mixing chamber housing 10 and flow distribution plate 40, simple installation, structure is simple.Alternatively, the height in igniting face 214 is less than the height of outgassing groove 224, the flame internal flame highest temperature of burning in snare 220 is effectively avoided to roast the ignition device on igniting face 214 and affect use, blow out when it also avoid the air blast gas stream burning weak to the Chang Minghuo on igniting face 214 that the flame in burning snare 220 formed simultaneously, improve the service life of each device on igniting face 214, reliability is high.
Consult Fig. 1, in the preferred embodiment, alternatively, for ease of ignition operation, gas burner also can comprise electronic ignition lever 70, and electronic ignition lever 70 runs through base 210, one end extends on igniting face 214, and the other end extends to the outside of mixing chamber housing 10 sidewall.Alternatively, for improving reliability and the security of igniting, electronic ignition lever 70 can select two.
Consult Fig. 1, in the preferred embodiment, alternatively, gas burner also comprises burner hearth body, the sidewall of mixing chamber housing 10 has extended radially outward mounting edge 130, mixing chamber housing 10 is installed on burner hearth body bottom through mounting edge 130, and cover plate assembly 20 is positioned in burner hearth body, and the top of burning snare 220 is formed with the step 226 for locating with burner hearth body fits.Particularly, mounting edge 130 can be provided with flange connecting hole, so that mixing chamber housing 10 is fixed on burner hearth body bottom, and utilize the step 226 on burning snare 220 to position, ensure the stability of structure.In the present embodiment, burner hearth body is circular.
As can be seen from the above description, the utility model the above embodiments achieve following technique effect:
According to the utility model gas burner, the premix chamber 110 that mixing chamber housing 10 is formed all is communicated with air intake pipe and gas inlet pipe 30, the air in air intake pipe and the combustion gas in gas inlet pipe 30 is made to carry out premix in premix chamber 110, air after premix and combustion gas flow in the second passage 222 through the first passage 212, then are flowed out for gas firing by outgassing groove 224.So, the setting of outgassing groove 224, air-flow in same second passage 222 is flowed out from multiple outgassing groove 224 respectively, outgassing groove 224 is shunted the air-flow in each second passage 222, and airflow direction flows out along burning snare 220 side by upwards changing to, the noise produced when effectively reducing gas shock burning, reduces noise pollution during burning, sufficient combustion.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.
Claims (10)
1. a gas burner, is characterized in that, comprising:
Mixing chamber housing (10), the interior zone of described mixing chamber housing (10) forms the premix chamber (110) being communicated with air intake pipe and gas inlet pipe (30);
Cover plate assembly (20), comprise the base (210) be arranged on described mixing chamber housing (10) and the burning snare (220) be arranged on described base (210), described base (210) offers the first passage (212) that multiple and described premix chamber (110) is communicated with, the second passage (222) that multiple and described first passage (212) is communicated with is offered in described burning snare (220), the inwall of described burning snare (220) offers the outgassing groove (224) arranged along described burning snare (220) circumference, described outgassing groove (224) is intervally arranged for multiple and along described burning snare (220) axial direction, and the second passage (222) described in each and the conducting of multiple described outgassing groove (224).
2. gas burner according to claim 1, is characterized in that,
Described outgassing groove (224) is cannelure, and spacing between adjacent described outgassing groove (224) is equal.
3. gas burner according to claim 1, is characterized in that,
Demarcation strip (120) is provided with in described mixing chamber housing (10), described premix chamber (110) is divided into the first premix chamber (112) be communicated with described air intake pipe and described gas inlet pipe (30) through described demarcation strip (120), and the second premix chamber (114) to be communicated with described first passage (212), described demarcation strip (120) offers the through hole (122) for being communicated with described first premix chamber (112) and described second premix chamber (114).
4. gas burner according to claim 3, is characterized in that,
Described second premix chamber (114) is less than the sectional area in exit at the sectional area of porch.
5. gas burner according to claim 1, is characterized in that,
Described burning snare (220) and the 3rd premix chamber (230) be formed between described base (210) for being communicated with described first passage (212) and described second passage (222).
6. gas burner according to claim 1, is characterized in that,
Flow distribution plate (40) is provided with in described mixing chamber housing (10), the bottom of described flow distribution plate (40) offers multiple fresh air inlet (410) for being communicated with described air intake pipe and described premix chamber (110), and the sidewall of described flow distribution plate (40) offers multiple air admission hole (420) for being communicated with described gas inlet pipe (30) and described premix chamber (110).
7. gas burner according to claim 6, is characterized in that,
The bottom of described mixing chamber housing (10) is provided with air intake interface (50), described air intake interface (50) offers the air inlet (510) being communicated with described air intake pipe and described fresh air inlet (410), and described air inlet (510) inwall is formed with the screw thread for being connected with described air intake pipe.
8. gas burner according to claim 7, is characterized in that,
Described base (210) is formed with igniting face (214), described first passage (212) around described igniting face (214) outer circumference to setting, described gas burner also comprises Chang Minghuo bar (60), the through described base (210) of described Chang Minghuo bar (60), one end is arranged on described igniting face (214), the other end extends to the outside of described flow distribution plate (40) bottom and is positioned at described air inlet (510), the sidewall of described Chang Minghuo bar (60) is communicated with gas supply pipe (610), the inlet end of described gas supply pipe (610) extends to the outside of described mixing chamber housing (10) sidewall.
9. gas burner according to claim 8, is characterized in that,
Described gas burner also comprises electronic ignition lever (70), described electronic ignition lever (70) runs through described base (210), one end extends on described igniting face (214), and the other end extends to the outside of described mixing chamber housing (10) sidewall.
10. the gas burner according to claim 1 to 9 any one, is characterized in that,
Described gas burner also comprises burner hearth body, the sidewall of described mixing chamber housing (10) has extended radially outward mounting edge (130), described mixing chamber housing (10) is installed on described burner hearth body bottom through described mounting edge (130), described cover plate assembly (20) is positioned at described burner hearth body, and the top of described burning snare (220) is formed with the step (226) for locating with described burner hearth body fits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520023562.8U CN204438119U (en) | 2015-01-14 | 2015-01-14 | Gas burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520023562.8U CN204438119U (en) | 2015-01-14 | 2015-01-14 | Gas burner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204438119U true CN204438119U (en) | 2015-07-01 |
Family
ID=53605980
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520023562.8U Active CN204438119U (en) | 2015-01-14 | 2015-01-14 | Gas burner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204438119U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108180480A (en) * | 2018-02-12 | 2018-06-19 | 深圳市人人节能设备有限公司 | Intracavitary premixes safety warehouse |
| CN108703669A (en) * | 2018-06-26 | 2018-10-26 | 陈显韶 | Smokeless fuel baking oven gas burning system |
| CN109973995A (en) * | 2019-04-29 | 2019-07-05 | 深圳市人人节能设备有限公司 | Premix burner and premixing gas range |
-
2015
- 2015-01-14 CN CN201520023562.8U patent/CN204438119U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108180480A (en) * | 2018-02-12 | 2018-06-19 | 深圳市人人节能设备有限公司 | Intracavitary premixes safety warehouse |
| CN108703669A (en) * | 2018-06-26 | 2018-10-26 | 陈显韶 | Smokeless fuel baking oven gas burning system |
| CN109973995A (en) * | 2019-04-29 | 2019-07-05 | 深圳市人人节能设备有限公司 | Premix burner and premixing gas range |
| CN109973995B (en) * | 2019-04-29 | 2024-04-19 | 深圳市人人节能设备有限公司 | Premixing burner and premixing gas stove |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180511 Address after: 414416 Dali Village, Bi Shi Town, Miluo City, Yueyang, Hunan Patentee after: Hunan DESAY Kitchen Equipment Co., Ltd. Address before: 415000 No. 13 industrial road, Chiang Jia Zui Town, Hanshou County, Changde, Hunan. Patentee before: Liu Laxi |