CN106225242B - Double-hearth heat-conducting oil boiler - Google Patents
Double-hearth heat-conducting oil boiler Download PDFInfo
- Publication number
- CN106225242B CN106225242B CN201610793323.XA CN201610793323A CN106225242B CN 106225242 B CN106225242 B CN 106225242B CN 201610793323 A CN201610793323 A CN 201610793323A CN 106225242 B CN106225242 B CN 106225242B
- Authority
- CN
- China
- Prior art keywords
- heat
- flue
- hearth
- conduction oil
- double
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H7/00—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release
- F24H7/02—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release the released heat being conveyed to a transfer fluid
- F24H7/04—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release the released heat being conveyed to a transfer fluid with forced circulation of the transfer fluid
- F24H7/045—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release the released heat being conveyed to a transfer fluid with forced circulation of the transfer fluid using fluid fuel
- F24H7/0466—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release the released heat being conveyed to a transfer fluid with forced circulation of the transfer fluid using fluid fuel the transfer fluid being water
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/0005—Details for water heaters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/18—Arrangement or mounting of grates or heating means
- F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
- F24H9/1832—Arrangement or mounting of combustion heating means, e.g. grates or burners
- F24H9/1836—Arrangement or mounting of combustion heating means, e.g. grates or burners using fluid fuel
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Air Supply (AREA)
- Combustion Of Fluid Fuel (AREA)
Abstract
The invention discloses a double-hearth heat conduction oil boiler which comprises a boiler body, two flues and a heat conduction oil pipe, wherein the interior of the boiler body is divided into a left hearth and a right hearth by a partition wall, the number of the flues is two, and the two flues are respectively communicated with smoke outlets at the top ends of the two hearths; the bottom parts of the two hearths are respectively provided with a combustion chamber, the side part of each combustion chamber is provided with a pulverized coal burner, the inner wall of each combustion chamber is closely provided with a U-shaped transverse coil pipe, each pulverized coal burner is arranged opposite to the corresponding U-shaped transverse coil pipe, the inner wall of an upper furnace chamber above the combustion chamber in the hearths is closely provided with a rectangular transverse coil pipe, and the U-shaped transverse coil pipe and the rectangular transverse coil pipe are both communicated with the heat conduction oil pipe. The furnace body is divided into two furnace chambers by the partition wall, the bottom parts of the two furnace chambers are respectively provided with the combustion chambers, and the two combustion chambers are combusted together, so that the heating efficiency can be effectively improved.
Description
Technical Field
The invention relates to a double-hearth heat conduction oil boiler, and belongs to the technical field of boiler structure design.
Background
The existing heat conduction oil boiler is a forced circulation boiler, and the working principle of the forced circulation oil boiler is that low-temperature heat conduction oil enters the boiler and is heated to become high-temperature heat conduction oil, heat generated by combustion in the boiler is taken out and is transferred to heat utilization equipment, and the low-temperature heat conduction oil is changed into low-temperature heat conduction oil and then is circularly heated by a circulating pump. The existing heat conducting oil boiler only has one hearth, and partial pipelines of heat conducting oil pipes are arranged in the hearth. The problem that this current conduction oil boiler exists is that the structure is reasonable inadequately, and heating efficiency is lower.
Disclosure of Invention
Therefore, the invention aims to provide the double-hearth heat conduction oil boiler with a reasonable structure, and the heating efficiency can be effectively improved by adopting the double-hearth heat conduction oil boiler.
The technical scheme for realizing the purpose of the invention is as follows:
a double-hearth heat conducting oil boiler comprises a boiler body, a flue and a heat conducting oil pipe; the interior of the furnace body is divided into a left hearth and a right hearth by a partition wall, the number of the flues is two, and the two flues are respectively communicated with smoke outlets at the top ends of the two hearths; the bottom of each hearth is provided with a combustion chamber, the side part of each combustion chamber is provided with a pulverized coal burner, the inner wall of each combustion chamber is closely provided with a U-shaped transverse coil pipe, each pulverized coal burner is arranged opposite to the corresponding U-shaped transverse coil pipe, the inner wall of an upper furnace chamber above the combustion chamber in each hearth is closely provided with a rectangular transverse coil pipe, and the U-shaped transverse coil pipes and the rectangular transverse coil pipes are communicated with the heat conduction oil pipes.
In the technical scheme, U-shaped ventilation pipelines are arranged at corresponding positions between the combustion chamber and the upper furnace chamber on the side walls of the two furnaces, air outlet pipes for blowing air into the furnaces are arranged on the U-shaped ventilation pipelines at intervals, the U-shaped ventilation pipelines are connected with a blower, and each pulverized coal burner is arranged opposite to the corresponding U-shaped ventilation pipeline.
In the technical scheme, each flue comprises a transverse flue, a vertical flue and a discharge flue, the top end of the vertical flue is communicated with the smoke outlet through the transverse flue, the discharge flue is communicated with the bottom end of the vertical flue, a high-temperature economizer, a low-temperature economizer and an air preheater are sequentially arranged on the vertical flue from top to bottom, and partial pipelines of the heat conduction oil pipes are arranged in the high-temperature economizer and the low-temperature economizer.
In the technical scheme, the lowest end of the vertical flue, namely the position close to the ground, is communicated with a denitration device, and the discharge flue is communicated with an outlet of the denitration device.
In the technical scheme, a plurality of soot blowing reserved holes are arranged on the vertical flue at intervals from top to bottom.
In the technical scheme, the mouth of the air outlet pipe is in a bell mouth shape with a large outside and a small inside, and the flaring angle is 30-45 degrees.
In the technical scheme, the side wall of each combustion chamber is provided with a nitrogen fire extinguishing port.
In the technical scheme, a heat recovery device is arranged on the exhaust flue; the heat recovery device comprises a gravity heat pipe and a heat storage box, the heat storage box comprises a heat preservation shell and a phase change heat storage material arranged in the heat preservation shell, an evaporation section of the gravity heat pipe extends into the interior of the exhaust flue, a condensation section of the gravity heat pipe extends into the interior of the heat storage box, and a part of pipelines of the domestic water circulation pipeline are buried in the interior of the phase change heat storage material.
The invention has the positive effects that: (1) the furnace body is divided into two furnace chambers by the partition wall, and the bottom parts of the two furnace chambers are respectively provided with the combustion chambers, which is equivalent to that the boiler is provided with two sets of heating systems, and the two combustion chambers are combusted together, so that the heating efficiency and the heat exchange efficiency can be effectively improved. (2) Further, U-shaped vent pipes are arranged on the side walls of the hearths and around the hearths above the combustion chambers, air outlet pipes for blowing air into the hearths are arranged on the U-shaped vent pipes at intervals, when the boiler works, air is blown into the hearths through the air outlet pipes, pulverized coal can be promoted to be fully combusted, and meanwhile coking on the upper edges of the combustion chambers can be prevented due to the thrust effect of airflow on fireworks.
Drawings
FIG. 1 is a schematic structural diagram of a double-hearth heat transfer oil boiler according to the present invention;
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;
FIG. 3 is a cross-sectional view taken along line B-B of FIG. 1;
FIG. 4 is a cross-sectional view taken along line C-C of FIG. 1;
FIG. 5 is an enlarged view of a portion of FIG. 2 at D;
FIG. 6 is a partial view of the exhaust stack of the present invention;
FIG. 7 is a schematic view of the U-shaped vent tube of the present invention;
FIG. 8 is a top view of the U-shaped retaining wall coil (containing the pulverized coal burner) of the present invention.
The reference symbols shown in the figures are: 1-furnace body; 2-flue; 3-discharging the flue; 4-heat conducting oil pipe; 5-hearth; 51-a combustion chamber; 52-pulverized coal burner; 53-upper oven chamber; 6-partition wall; 7-domestic water circulation pipeline; 8-U-shaped vent lines; 81-air outlet pipe; 9-high temperature economizer; 10-low temperature economizer; 11-an air preheater; 12-a support beam; 121-fins; 13-an air preheater; 14-a denitrification facility; 15-nitrogen fire extinguishing port; 16-gravity heat pipes; 17-a heat storage tank; 18-a heat-insulating shell; 19-a phase change heat storage material; 20-U-shaped transverse coil; 21-transverse flue; 22-vertical flue; 23-rectangular transverse coil.
Detailed Description
The specific structure of the invention is described below with reference to the accompanying drawings:
a double-hearth heat conducting oil boiler is shown in figures 1 to 4 and comprises a boiler body 1, a flue 2 and a heat conducting oil pipe 4; the furnace body 1 is internally divided into a left hearth 5 and a right hearth 5 by a partition wall 6, the number of the flues 2 is two, and the two flues 2 are respectively communicated with smoke outlets at the top ends of the two hearths 5; combustion chambers 51 are arranged at the bottoms of the two hearths 5, pulverized coal burners 52 are arranged at the side parts of the combustion chambers 51, U-shaped transverse coil pipes 20 are closely arranged on the inner walls of the combustion chambers 51, the pulverized coal burners 52 are arranged opposite to the corresponding U-shaped transverse coil pipes 20, as shown in fig. 8, rectangular transverse coil pipes 23 are closely arranged on the inner walls of an upper furnace chamber 53 above the combustion chambers 51 in the hearths 5, and the U-shaped transverse coil pipes 20 and the rectangular transverse coil pipes 23 are both communicated with the heat-conducting oil pipe 4. The furnace body is divided into two furnace chambers by the partition wall, and the bottom parts of the two furnace chambers are respectively provided with the combustion chambers, which is equivalent to that the boiler is provided with two sets of heating systems, and the two combustion chambers are combusted together, so that the heating efficiency and the heat exchange efficiency can be effectively improved.
Further, U-shaped vent pipes 8 are arranged at corresponding positions between the combustion chamber 51 and the upper furnace chamber 53 on the side walls of the furnaces 5, air outlet pipes 81 for blowing air into the furnaces 5 are arranged on the U-shaped vent pipes 8 at intervals, the U-shaped vent pipes 8 are connected with a blower, when the boiler works, air is blown into the furnaces 5 through the air outlet pipes 81, secondary combustion of sufficient unburnt coal powder at corresponding positions can be promoted, the heat exchange effect is improved, and meanwhile coking at the upper edge of the combustion chamber can be prevented due to the thrust effect of airflow on fireworks. Preferably, the mouth of the air outlet pipe 81 is in a bell mouth shape with a large outside and a small inside, and the flaring angle is 30 to 45 degrees.
In this embodiment, each flue 2 includes a transverse flue 21, a vertical flue 22 and a discharge flue 3, the top end of the vertical flue 22 is communicated with the smoke outlet through the transverse flue 21, the discharge flue 3 is communicated with the bottom end of the vertical flue 22, a high-temperature economizer 9, a low-temperature economizer 10 and an air preheater 13 are sequentially arranged on the vertical flue 22 from top to bottom, part of pipelines of the heat conduction oil pipe 4 are arranged in the high-temperature economizer 9 and the low-temperature economizer 10, a flow route of heat conduction oil in the heat conduction oil pipe 4 sequentially flows through the low-temperature economizer 10, the high-temperature economizer 9 and the furnace 5 and then flows to a heat utilization device, the heat conduction oil is gradually preheated by the low-temperature economizer 9 and the high-temperature economizer 10 and then flows into the furnace 5 for further heating, the heat exchange effect is good, and the heat exchange efficiency is high.
In the embodiment, the denitration device 14 is communicated with the lowest end of the vertical flue 22, namely the position close to the ground, and the exhaust flue 3 is communicated with the outlet of the denitration device 14, so that the installation difficulty of the denitration device 14 can be reduced, and the denitration device 14 can prevent the environment pollution caused by excessive NOx generated after coal in the boiler is combusted.
In this embodiment, a plurality of soot blowing reserved holes are arranged on the vertical flue 22 at intervals from top to bottom, and the soot blowing reserved holes are arranged, so that air is blown into the vertical flue 22 through the soot blowing reserved holes after the boiler works for a period of time, thereby blowing off soot adhered to the side wall of the vertical flue 22 and avoiding blockage in the flue.
As shown in fig. 5, a supporting beam 12 is disposed in the partition wall 6 at a position corresponding to the U-shaped ventilation ducts 8, the supporting beam 12 is of a hollow tubular structure and is connected in series with the two U-shaped ventilation ducts 8 to serve as a part of the pipelines of the two U-shaped ventilation ducts 8, fins 121 extending outward are disposed outside the supporting beam 12, the fins 121 are embedded in the partition wall, and the air outlet pipes 81 respectively filling air into the two hearths 5 are disposed on opposite sides of the supporting beam 12. The supporting beam 12 is used as a part of the U-shaped ventilation duct 8 and is embedded in the partition wall 6 to reinforce the strength of the partition wall 6, and the existence of the fins 121 can enhance the bonding force of the partition wall body. Further, the material of the supporting beam 12 is steel.
In the present embodiment, the side walls of the combustion chambers 51 are provided with nitrogen gas fire extinguishing ports 15, and the purpose of the nitrogen gas fire extinguishing ports 11 is to be able to extinguish the flames in the combustion chambers 51 by charging nitrogen gas into the combustion chambers 51 as necessary.
As shown in fig. 6, a heat recovery device is provided on the exhaust flue 3; the heat recovery device comprises a gravity heat pipe 16 and a heat storage tank 17, the heat storage tank 17 comprises a heat preservation shell 18 and a phase change heat storage material 19 arranged in the heat preservation shell 18, an evaporation section of the gravity heat pipe 16 extends into the inside of the exhaust flue 3, a condensation section of the gravity heat pipe 16 extends into the inside of the heat storage tank 17, and a part of pipelines of the domestic water circulation pipeline 7 are buried in the inside of the phase change heat storage material 19. In the embodiment, the gravity heat pipe evaporation section transfers the heat in the flue 2 to the condensation section through the heat recovery device and stores the heat in the phase-change heat storage material, so that the gravity heat pipe has the characteristic of unidirectional heat transfer and the heat preservation shell 18 exists, the heat collected in the phase-change heat storage material can be effectively prevented from losing, the heat in the phase-change heat storage material can heat the domestic water of the domestic water circulation pipeline 7, and the energy is saved; furthermore, heat-absorbing core heat pipes penetrate through the phase change heat storage materials in the heat storage box, and one ends of the heat-absorbing core heat pipes are tightly connected with the condensation sections of the gravity heat pipes, so that the heat exchange surfaces of the heat conduction pipes and the phase change heat storage materials are increased, the heat exchange effect is enhanced, and the capacity of the phase change heat storage material layer is increased when the heat storage capacity is improved.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And such obvious changes and modifications which fall within the spirit of the invention are deemed to be covered by the present invention.
Claims (6)
1. A double-hearth heat conducting oil boiler comprises a boiler body (1), a flue (2) and a heat conducting oil pipe (4); the furnace is characterized in that the interior of the furnace body (1) is divided into a left hearth and a right hearth (5) by a partition wall (6), the number of the flues (2) is two, and the two flues (2) are respectively communicated with smoke outlets at the top ends of the two hearths (5); combustion chambers (51) are respectively arranged at the bottoms of the two hearths (5), pulverized coal burners (52) are arranged at the side parts of the combustion chambers (51), U-shaped transverse coils (20) are closely arranged on the inner walls of the combustion chambers (51), each pulverized coal burner (52) is arranged opposite to the corresponding U-shaped transverse coil (20), rectangular transverse coils (23) are closely arranged on the inner walls of upper furnace chambers (53) above the combustion chambers (51) in the hearths (5), the U-shaped transverse coils (20) and the rectangular transverse coils (23) are both communicated with the heat-conducting oil pipes (4), U-shaped ventilation pipelines (8) are arranged at corresponding positions between the combustion chambers (51) and the upper furnace chambers (53) on the side walls of the hearths (5), and air outlet pipes (81) blowing air into the hearths (5) are arranged on the U-shaped ventilation pipelines (8) at intervals, the U-shaped ventilation pipeline (8) is connected with the air feeder, the mouth of the air outlet pipe (81) is in a horn mouth shape with a large outside and a small inside, and the flaring angle is 30-45 degrees.
2. The double-hearth conduction oil boiler according to claim 1, characterized in that: each flue (2) comprises a transverse flue (21), a vertical flue (22) and a discharge flue (3), the top end of the vertical flue (22) is communicated with the smoke outlet through the transverse flue (21), the discharge flue (3) is communicated with the bottom end of the vertical flue (22), a high-temperature economizer (9), a low-temperature economizer (10) and an air preheater (13) are sequentially arranged on the vertical flue (22) from top to bottom, and partial pipelines of the heat conduction oil pipe (4) are arranged in the high-temperature economizer (9) and the low-temperature economizer (10).
3. The double-hearth conduction oil boiler according to claim 2, characterized in that: and a denitration device (14) is arranged at the bottommost end of the vertical flue (22), namely, the position close to the ground, in a communicated manner, and the discharge flue (3) is communicated with an outlet of the denitration device (14).
4. The double-hearth conduction oil boiler according to claim 2, characterized in that: a plurality of soot blowing reserved holes are arranged on the vertical flue (22) at intervals from top to bottom.
5. The double-hearth conduction oil boiler according to claim 1, characterized in that: and a nitrogen fire extinguishing port (15) is arranged on the side wall of each combustion chamber (51).
6. The double-hearth conduction oil boiler according to claim 2, characterized in that: a heat recovery device is arranged on the discharge flue (3); the heat recovery device comprises a gravity heat pipe (16) and a heat storage tank (17), the heat storage tank (17) comprises a heat preservation shell (18) and a phase change heat storage material (19) arranged in the heat preservation shell (18), an evaporation section of the gravity heat pipe (16) extends into the inside of the exhaust flue (3), a condensation section of the gravity heat pipe (16) extends into the inside of the heat storage tank (17), and a part of pipeline of the domestic water circulation pipeline (7) is embedded in the inside of the phase change heat storage material (19).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610793323.XA CN106225242B (en) | 2016-08-30 | 2016-08-30 | Double-hearth heat-conducting oil boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610793323.XA CN106225242B (en) | 2016-08-30 | 2016-08-30 | Double-hearth heat-conducting oil boiler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106225242A CN106225242A (en) | 2016-12-14 |
| CN106225242B true CN106225242B (en) | 2021-11-02 |
Family
ID=58074989
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610793323.XA Active CN106225242B (en) | 2016-08-30 | 2016-08-30 | Double-hearth heat-conducting oil boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106225242B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107816801A (en) * | 2017-11-20 | 2018-03-20 | 江苏太湖锅炉股份有限公司 | π type fuel vapor organic heat carrier furnaces |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2847159Y (en) * | 2006-06-05 | 2006-12-13 | 徐泽宇 | Utilizing device for boiler smoke waste heat |
| CN201074915Y (en) * | 2007-08-15 | 2008-06-18 | 马立仁 | Solar water heater |
| CN201462947U (en) * | 2009-06-19 | 2010-05-12 | 尹浚生 | Double-hole honeycomb coal saving furnace |
| CN102889601B (en) * | 2012-11-05 | 2015-07-15 | 泰兴市福昌固废处理有限公司 | Chemical industrial waste residue incinerator capable of being washed on line |
| CN105526599B (en) * | 2016-01-26 | 2018-05-25 | 华北电力大学 | The upgrading of clean type coal-burning boiler smoke discharging residual heat utilizes system |
| CN205402646U (en) * | 2016-02-24 | 2016-07-27 | 广西梧锅锅炉制造有限公司 | High pressure bagasse fuel boiler |
| CN206037420U (en) * | 2016-08-30 | 2017-03-22 | 浙江特富锅炉有限公司 | Double -hearth conduction oil boiler |
-
2016
- 2016-08-30 CN CN201610793323.XA patent/CN106225242B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN106225242A (en) | 2016-12-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201640429U (en) | Heater for bulk curer | |
| JPH0313482B2 (en) | ||
| CN102132947B (en) | Heater for bulk curing barn | |
| CN106225242B (en) | Double-hearth heat-conducting oil boiler | |
| CN104676617B (en) | A kind of burning boiler flue accumulation prevention structure | |
| CN101660840B (en) | Hot-blast stove with combustion equipment | |
| CN106225241B (en) | Coking-proof structure of double-hearth heat-conducting oil boiler | |
| CN103542518A (en) | Biomass double-heat-exchange reversal burning type hot-air furnace | |
| TWI649522B (en) | Water heater having a down fired combustion assembly | |
| CN205980318U (en) | Double -furnace thorax conduction oil boiler anti -coking structure | |
| CN207247541U (en) | A kind of hot-blast stove | |
| CN206037420U (en) | Double -hearth conduction oil boiler | |
| CN209877373U (en) | Multiple condensation structure of gas hanging stove and boiler | |
| CN203949146U (en) | Combined screw thread pipe boiler | |
| CN104791994A (en) | Vertical double-pass gas-fired hot water boiler | |
| CN209877372U (en) | Superconducting liquid heat exchange wall-mounted gas boiler and boiler | |
| CN210979880U (en) | Chemical waste gas incineration system | |
| CN2458503Y (en) | Secondary combustion hot-air furnace with reflecting arch | |
| CN104566387A (en) | Boiler for domestic garbage incineration | |
| RU90174U1 (en) | WATER BOILER | |
| CN201203329Y (en) | Baking room and heating device thereof | |
| CN203744532U (en) | Biomass double heat exchange reverse burning type air heating furnace | |
| CN211424347U (en) | Steam-driven heat injection boiler | |
| CN2457453Y (en) | Large hot-air furnace with reflective arch energy secondary burning | |
| CN109812976B (en) | Multiple condensation structure of gas hanging stove and boiler |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: 314408 No.36 Qichao Road, Chang'an Town (Nongfa District), Haining City, Jiaxing City, Zhejiang Province Applicant after: Zhejiang Tefu Development Co.,Ltd. Address before: 314408 No.36 Qichao Road, Chang'an Town (Nongfa District), Haining City, Jiaxing City, Zhejiang Province Applicant before: ZHEJIANG TUFF BOILER Co.,Ltd. |
|
| CB02 | Change of applicant information | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |