CN106642697A - High-pressure heater for nuclear power plant - Google Patents
High-pressure heater for nuclear power plant Download PDFInfo
- Publication number
- CN106642697A CN106642697A CN201610941470.7A CN201610941470A CN106642697A CN 106642697 A CN106642697 A CN 106642697A CN 201610941470 A CN201610941470 A CN 201610941470A CN 106642697 A CN106642697 A CN 106642697A
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- Prior art keywords
- straight
- bar
- parts
- pressure heater
- projection
- 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.)
- Pending
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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
- F24H9/00—Details
- F24H9/0005—Details for water heaters
- F24H9/001—Guiding means
- F24H9/0015—Guiding means in water channels
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/02—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using non-aqueous solutions
- C23C22/03—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using non-aqueous solutions containing phosphorus compounds
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
- F28F1/40—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only inside the tubular element
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
- F28F19/02—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings
- F28F19/04—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings of rubber; of plastics material; of varnish
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2222/00—Aspects relating to chemical surface treatment of metallic material by reaction of the surface with a reactive medium
- C23C2222/20—Use of solutions containing silanes
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Geometry (AREA)
- Combustion & Propulsion (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention discloses a high-pressure heater for a nuclear power plant. The high-pressure heater comprises a heat exchange pipe. The heat exchange pipe comprises a straight pipe section. Multiple straight rods are arranged in the straight pipe section. Every two adjacent straight rods in the axial direction of the straight pipe section are staggered and are fixed to the inner wall of the straight pipe section through multiple support rods. Multiple cylindrical protruding columns are arranged on the peripheral wall of each straight rod in an extending manner. The connecting points of the protruding columns connected to the same straight rod and the straight rod are located on the same cylinder spiral line. Each straight rod serves as the cylinder of the corresponding cylinder spiral line, and each cylinder spiral line spirally extends along the corresponding straight rod in the axial direction. Multiple through holes evenly distributed in the protruding column in the axial direction are formed in each protruding column. The axes of the through holes are eccentrically arranged relative to the axes of the corresponding straight rods. Multiple spring sets are fixedly arranged on the inner wall of the straight pipe section. One spring set is located between every two adjacent straight rods. According to the high-pressure heater for the nuclear power plant, a turbulent structure capable of making water generate turbulent flow is arranged in the straight pipe section of the heat exchange pipe, the turbulent flow can be generated when the water flows through the straight pipe section, and the water heating effect can be improved.
Description
Technical field
The present invention relates to used in nuclear power station high-pressure heater.
Background technology
Nuclear power station（nuclear power plant）It is using nuclear fission (Nuclear Fission) or nuclear fusion
The power plant of the discharged energy production electric energy of (Nuclear Fusion) reaction.Nuclear plant during at present business operates
All it is to be reacted using nuclear fission and generated electricity.Nuclear power station is generally divided into two parts：The nuclear island of steam is produced using nuclear fission（Bag
Include reactor assembly and primary Ioops system）With the conventional island using steam-electric power（Including steam turbine generator system）, the combustion for using
Material is usually radioactivity heavy metal：Uranium, plutonium.
High-pressure heater is the important device of steam turbine generator system, and the effect of high-pressure heater is using in steam turbine
The steam of part work(was done, heating feedwater in heater was evacuated to, the temperature of water was improved, the steaming that steam turbine is discharged in condenser was reduced
Vapour amount, reduces energy loss, improves the cycle efficieny of therrmodynamic system.
High-pressure heater generally comprises intake chamber, water inlet tube sheet, water-supplying chamber, water outlet tube sheet and some heat exchanger tubes, heat exchanger tube
Two ends link together with water inlet tube sheet, water outlet tube sheet respectively, feed water and circulated in heat exchanger tube；Steaming of the heat exchanger tube in heater
Headroom, absorbs the heat of heating steam, and by pipe wall of heat exchange pipe the water of Bottomhole pressure is passed to.
The structure of heat exchanger tube is single in existing high-pressure heater, and the heating effect of feedwater has much room for improvement in heat exchanger tube.
The content of the invention
It is an object of the invention to provide a kind of used in nuclear power station high-pressure heater, it arranges energy in the straight length of heat exchanger tube
Make water produce the turbulent structure of turbulent flow, turbulent flow can be produced when water circulates in straight length, the heating effect of water can be improved.
For achieving the above object, a kind of used in nuclear power station high-pressure heater of design, including water inlet be the technical scheme is that
Room, water inlet tube sheet, water-supplying chamber, water outlet tube sheet and some heat exchanger tubes, the two ends of heat exchanger tube connect respectively with water inlet tube sheet, water outlet tube sheet
It is connected together；
The heat exchanger tube includes cylindrical, hollow straight length；
Some cylindrical straight-bars, the axle center of each straight-bar and the axis parallel of straight length are provided with the straight length, each straight-bar is along straight
The axial direction of pipeline section is uniform, and adjacent two straight-bar mutual dislocations on straight length axial direction；
The straight-bar is fixed by some support bars with the inwall of straight length；The support bar of same straight-bar is connected to, they are located at
The axis perpendicular of same plane, the plane and straight-bar, and the plane is located at the axial end portion of straight-bar；
Some cylindrical projections are extended with the straight-bar periphery wall, each projection is vertical with straight-bar respectively；It is connected to same straight-bar
Projection, they are located at the tie point of the straight-bar on same circular helix, the circular helix with the straight-bar as cylinder, and
Extend along the straight-bar axial screw；Each projection is provided with along the axially uniform some through holes of the projection, and the axle center phase of each through hole
For the axle center of straight-bar biases；
Some groups of springs are further fixed on the straight length inwall, single groups of springs is located between two adjacent straight-bars；It is single
Groups of springs includes：The some cylindrically coiled springs being fixed on straight length inwall；The axle center of each cylindrically coiled spring respectively with directly
The axis perpendicular of pipeline section；The axial length of each cylindrically coiled spring is the 3/5 of inside diameter of straight pipe section；The cylindrical screw of same groups of springs
Spring, they are located on same circular helix with the tie point of straight length inwall, and the circular helix is with straight length inwall
The face of cylinder, and extend along straight length axial screw.
Preferably, each projection end face and the maximum spacing of straight length inwall are the 1/5 of inside diameter of straight pipe section.
Preferably, the external diameter of the straight-bar is the 1/5 of inside diameter of straight pipe section.
Preferably, the straight-bar, support bar, projection and cylindrically coiled spring are all made up of alloy material.
Preferably, the outer surface of the straight-bar, support bar, projection and cylindrically coiled spring all Tu are covered with diaphragm.
Preferably, by weight, the diaphragm is composed of the following components：
15.6 parts of dibutyl phthalates,
8.5 parts of Isononyl benzoates,
1.3 parts of dye yam slag extracts,
1.2 parts of dibutyl tin laurates,
2.4 parts of tricresyl phosphates,
1.9 parts of 1,2- diethoxy estersil base ethane,
0.9 part of N- phenyl-2-naphthylamine,
1.4 parts of vinyltrimethoxy silanes,
1.1 parts of isomerous tridecanol polyoxyethylene ethers,
6.3 parts of N- VCzs.
The advantages of the present invention are：A kind of used in nuclear power station high-pressure heater is provided, it is in the straight of heat exchanger tube
The turbulent structure that water can be made to produce turbulent flow is set in pipeline section, turbulent flow can be produced when water circulates in straight length, adding for water can be improved
Thermal effect.
The present invention turbulent structure be made up of straight-bar, support bar, projection and cylindrically coiled spring etc., and straight-bar, support bar,
The structure arrangement of projection and cylindrically coiled spring is the key element of turbulent structure.Straight-bar, support bar, projection and cylinder in the present invention
Helical spring, and their structure arrangement, the water that can make circulation in heat exchanger tube straight length produces turbulent flow, and then improves water
Heating effect.
The straight-bar of the present invention, support bar, outer surface all Tu of projection and cylindrically coiled spring are covered with diaphragm, diaphragm by
Specific components are made, and diaphragm can improve the abrasion-resistant of straight-bar, support bar, projection and cylindrically coiled spring, decay resistance,
Ensure the Long-Time Service of straight-bar, support bar, projection and cylindrically coiled spring.
Description of the drawings
Fig. 1 is the schematic diagram of straight-bar in the present invention, support bar and projection；
Fig. 2 is the schematic diagram of groups of springs in the present invention.
Specific embodiment
With reference to the accompanying drawings and examples, the specific embodiment of the present invention is further described.Following examples are only
For clearly illustrating technical scheme, and can not be limited the scope of the invention with this.
The technical scheme that the present invention is embodied as is：
As shown in Figure 1 and Figure 2, a kind of used in nuclear power station high-pressure heater, including intake chamber, water inlet tube sheet, water-supplying chamber, water outlet tube sheet
With some heat exchanger tubes, the two ends of heat exchanger tube link together respectively with water inlet tube sheet, water outlet tube sheet；
The heat exchanger tube includes cylindrical, hollow straight length 1；
Some cylindrical straight-bars 2, the axle center of each straight-bar 2 and the axis parallel of straight length 1, each straight-bar 2 are provided with the straight length 1
Axial direction along straight length 1 is uniform, and adjacent two mutual dislocations of straight-bar 2 on the axial direction of straight length 1；
The straight-bar 2 is fixed by some support bars 3 with the inwall of straight length 1；The support bar 3 of same straight-bar 2 is connected to, they
It is generally aligned in the same plane, the axis perpendicular of the plane and straight-bar 2, and the plane is located at the axial end portion of straight-bar 2；
Some cylindrical projections 4 are extended with the periphery wall of the straight-bar 2, each projection 4 is vertical with straight-bar 2 respectively；It is connected to same
The projection 4 of straight-bar 2, they are located on same circular helix with the tie point of the straight-bar 2, and the circular helix is with the straight-bar 2
For cylinder, and extend along the axial screw of straight-bar 2；Each projection 4 is provided with along the axially uniform some through holes of the projection 4, and respectively
The axle center of through hole biases relative to the axle center of straight-bar 2；
Some groups of springs are further fixed on the inwall of the straight length 1, single groups of springs is located between two adjacent straight-bars 2；It is single
Individual groups of springs includes：The some cylindrically coiled springs 5 being fixed on the inwall of straight length 1；The axle center difference of each cylindrically coiled spring 5
With the axis perpendicular of straight length 1；The axial length of each cylindrically coiled spring 5 is the 3/5 of the internal diameter of straight length 1；Same groups of springs
Cylindrically coiled spring 5, they are located on same circular helix with the tie point of the inwall of straight length 1, and the circular helix is with straight
The inwall of pipeline section 1 is the face of cylinder, and is extended along the axial screw of straight length 1.
The end face of each projection 4 is the 1/5 of the internal diameter of straight length 1 with the maximum spacing of the inwall of straight length 1.
The external diameter of the straight-bar 2 is the 1/5 of the internal diameter of straight length 1.
The straight-bar 2, support bar 3, projection 4 and cylindrically coiled spring 5 are all made up of alloy material.
Outer surface all Tu of the straight-bar 2, support bar 3, projection 4 and cylindrically coiled spring 5 are covered with diaphragm.
By weight, the diaphragm is composed of the following components：
15.6 parts of dibutyl phthalates,
8.5 parts of Isononyl benzoates,
1.3 parts of dye yam slag extracts,
1.2 parts of dibutyl tin laurates,
2.4 parts of tricresyl phosphates,
1.9 parts of 1,2- diethoxy estersil base ethane,
0.9 part of N- phenyl-2-naphthylamine,
1.4 parts of vinyltrimethoxy silanes,
1.1 parts of isomerous tridecanol polyoxyethylene ethers,
6.3 parts of N- VCzs.
The present invention turbulent structure be made up of straight-bar 2, support bar 3, projection 4 and cylindrically coiled spring 5 etc., and straight-bar 2,
The structure arrangement of strut 3, projection 4 and cylindrically coiled spring 5 is the key element of turbulent structure.Straight-bar 2, support bar 3 in the present invention,
Projection 4 and cylindrically coiled spring 5, and their structure arrangement, can make the water generation of circulation in heat exchanger tube straight length 1 disorderly
Stream, and then improve the heating effect of water.
The straight-bar 2 of the present invention, support bar 3, outer surface all Tu of projection 4 and cylindrically coiled spring 5 are covered with diaphragm, protect
Film is made up of specific components, and diaphragm can improve the abrasion-resistant of straight-bar 2, support bar 3, projection 4 and cylindrically coiled spring 5, resistance to
Corrosive nature, ensures the Long-Time Service of straight-bar 2, support bar 3, projection 4 and cylindrically coiled spring 5.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, on the premise of without departing from the technology of the present invention principle, some improvements and modifications can also be made, these improvements and modifications
Also should be regarded as protection scope of the present invention.
Claims (6)
1. used in nuclear power station high-pressure heater, including intake chamber, water inlet tube sheet, water-supplying chamber, water outlet tube sheet and some heat exchanger tubes, heat exchange
The two ends of pipe link together respectively with water inlet tube sheet, water outlet tube sheet；It is characterized in that：
The heat exchanger tube includes cylindrical, hollow straight length；
Some cylindrical straight-bars, the axle center of each straight-bar and the axis parallel of straight length are provided with the straight length, each straight-bar is along straight
The axial direction of pipeline section is uniform, and adjacent two straight-bar mutual dislocations on straight length axial direction；
The straight-bar is fixed by some support bars with the inwall of straight length；The support bar of same straight-bar is connected to, they are located at
The axis perpendicular of same plane, the plane and straight-bar, and the plane is located at the axial end portion of straight-bar；
Some cylindrical projections are extended with the straight-bar periphery wall, each projection is vertical with straight-bar respectively；It is connected to same straight-bar
Projection, they are located at the tie point of the straight-bar on same circular helix, the circular helix with the straight-bar as cylinder, and
Extend along the straight-bar axial screw；Each projection is provided with along the axially uniform some through holes of the projection, and the axle center phase of each through hole
For the axle center of straight-bar biases；
Some groups of springs are further fixed on the straight length inwall, single groups of springs is located between two adjacent straight-bars；It is single
Groups of springs includes：The some cylindrically coiled springs being fixed on straight length inwall；The axle center of each cylindrically coiled spring respectively with directly
The axis perpendicular of pipeline section；The axial length of each cylindrically coiled spring is the 3/5 of inside diameter of straight pipe section；The cylindrical screw of same groups of springs
Spring, they are located on same circular helix with the tie point of straight length inwall, and the circular helix is with straight length inwall
The face of cylinder, and extend along straight length axial screw.
2. used in nuclear power station high-pressure heater according to claim 1, it is characterised in that each projection end face and straight length inwall
Maximum spacing for inside diameter of straight pipe section 1/5.
3. used in nuclear power station high-pressure heater according to claim 2, it is characterised in that the external diameter of the straight-bar is straight length
The 1/5 of internal diameter.
4. used in nuclear power station high-pressure heater according to claim 3, it is characterised in that the straight-bar, support bar, projection and
Cylindrically coiled spring is all made up of alloy material.
5. used in nuclear power station high-pressure heater according to claim 4, it is characterised in that the straight-bar, support bar, projection and
The outer surface of cylindrically coiled spring all Tu are covered with diaphragm.
6. used in nuclear power station high-pressure heater according to claim 5, it is characterised in that by weight, the diaphragm
It is composed of the following components：
15.6 parts of dibutyl phthalates,
8.5 parts of Isononyl benzoates,
1.3 parts of dye yam slag extracts,
1.2 parts of dibutyl tin laurates,
2.4 parts of tricresyl phosphates,
1.9 parts of 1,2- diethoxy estersil base ethane,
0.9 part of N- phenyl-2-naphthylamine,
1.4 parts of vinyltrimethoxy silanes,
1.1 parts of isomerous tridecanol polyoxyethylene ethers,
6.3 parts of N- VCzs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610941470.7A CN106642697A (en) | 2016-11-02 | 2016-11-02 | High-pressure heater for nuclear power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610941470.7A CN106642697A (en) | 2016-11-02 | 2016-11-02 | High-pressure heater for nuclear power plant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106642697A true CN106642697A (en) | 2017-05-10 |
Family
ID=58820460
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610941470.7A Pending CN106642697A (en) | 2016-11-02 | 2016-11-02 | High-pressure heater for nuclear power plant |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106642697A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107746602A (en) * | 2017-11-10 | 2018-03-02 | 常熟市梅李合金材料有限公司 | A kind of electric heater nickel filament |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5528471A (en) * | 1978-08-21 | 1980-02-29 | Mitsubishi Electric Corp | Heat transfer pipe |
| CN102434874A (en) * | 2011-12-15 | 2012-05-02 | 哈尔滨锅炉厂有限责任公司 | Nuclear power horizontal high-pressure water supply heater and heating method |
| CN103215578A (en) * | 2013-03-27 | 2013-07-24 | 佛山市中国地质大学研究院 | Metal passivant prepared from diosorea cirrhosa residue extracting liquid |
| CN203719506U (en) * | 2014-02-19 | 2014-07-16 | 杨承清 | Turbulence finned tube exchanger |
| CN104745078A (en) * | 2015-01-19 | 2015-07-01 | 杭州固邦涂料有限公司 | Anticorrosive paint and preparation method thereof |
| CN205037803U (en) * | 2015-10-20 | 2016-02-17 | 四川五环石化装备有限公司 | High -efficient oval finned tube of foraminiferous type |
-
2016
- 2016-11-02 CN CN201610941470.7A patent/CN106642697A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5528471A (en) * | 1978-08-21 | 1980-02-29 | Mitsubishi Electric Corp | Heat transfer pipe |
| CN102434874A (en) * | 2011-12-15 | 2012-05-02 | 哈尔滨锅炉厂有限责任公司 | Nuclear power horizontal high-pressure water supply heater and heating method |
| CN103215578A (en) * | 2013-03-27 | 2013-07-24 | 佛山市中国地质大学研究院 | Metal passivant prepared from diosorea cirrhosa residue extracting liquid |
| CN203719506U (en) * | 2014-02-19 | 2014-07-16 | 杨承清 | Turbulence finned tube exchanger |
| CN104745078A (en) * | 2015-01-19 | 2015-07-01 | 杭州固邦涂料有限公司 | Anticorrosive paint and preparation method thereof |
| CN205037803U (en) * | 2015-10-20 | 2016-02-17 | 四川五环石化装备有限公司 | High -efficient oval finned tube of foraminiferous type |
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| Title |
|---|
| 刘慧君等: "《化学商品600种》", 30 April 1989, 冶金工业出版社 * |
| 华东理工大学: "《节能减排理论基础与装备技术》", 31 May 2010, 华东理工大学出版社 * |
| 宣天鹏: "《表面工程技术的设计与选择》", 31 May 2011, 机械工业出版社 * |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107746602A (en) * | 2017-11-10 | 2018-03-02 | 常熟市梅李合金材料有限公司 | A kind of electric heater nickel filament |
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| PB01 | Publication | ||
| PB01 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170510 |