CN106369819A - Casing pipe type gas electric heating device - Google Patents
Casing pipe type gas electric heating device Download PDFInfo
- Publication number
- CN106369819A CN106369819A CN201610727998.4A CN201610727998A CN106369819A CN 106369819 A CN106369819 A CN 106369819A CN 201610727998 A CN201610727998 A CN 201610727998A CN 106369819 A CN106369819 A CN 106369819A
- Authority
- CN
- China
- Prior art keywords
- tube
- gas
- fin
- inner tube
- housing
- 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.)
- Granted
Links
- 238000005485 electric heating Methods 0.000 title claims abstract 7
- 238000010438 heat treatment Methods 0.000 claims abstract description 42
- 238000009413 insulation Methods 0.000 claims abstract description 16
- 238000007665 sagging Methods 0.000 claims description 6
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 3
- 229910001566 austenite Inorganic materials 0.000 claims description 3
- 229910001293 incoloy Inorganic materials 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 2
- 239000005439 thermosphere Substances 0.000 claims 1
- 238000004804 winding Methods 0.000 abstract description 7
- 230000017525 heat dissipation Effects 0.000 abstract 1
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 61
- 230000000694 effects Effects 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
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
- F24H3/00—Air heaters
- F24H3/002—Air heaters using electric energy supply
-
- 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
- F24H9/0052—Details for air heaters
- F24H9/0057—Guiding means
- F24H9/0063—Guiding means in air channels
-
- 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
- F24H9/1854—Arrangement or mounting of grates or heating means for air heaters
- F24H9/1863—Arrangement or mounting of electric heating means
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)
- Resistance Heating (AREA)
- Pipe Accessories (AREA)
- Direct Air Heating By Heater Or Combustion Gas (AREA)
Abstract
The invention discloses a casing pipe type gas electric heating device. The device comprises a gas inlet, a gas outlet, a shell, an inner pipe, an outer pipe, an electric heating wire, fins, a heat insulation layer and other components; the casing pipe type structural design is adopted in the gas electric heating device, the spiral fins are arranged outside the inner pipe, the electric heating wire is wound on the outer surface of the inner pipe along a gap between two adjacent spiral fins, the outer pipe is arranged on the outer sides of the fins, a whole casing pipe is fixed in the shell, and the heat insulation layer is arranged between the outer pipe and the shell. A spiral winding gas flow way is formed between the spiral fins and the outer pipe, the gas flow way is prolonged, and the device is high in heating speed and uniform in gas heating; heated gas flows through the winding type flow way on the outer side of the inner pipe, is heated to a certain temperature and then is reheated through the inner side of the inner pipe, the wall temperature of the outer pipe is relatively low, meanwhile, the heat insulation layer is arranged between the shell and the outer pipe of the electric heating device, heat dissipation losses are reduced, and the heat efficiency of the device is improved.
Description
Technical field
The invention belongs to technical field of heat exchangers, it is related to a kind of electric gas heater and in particular to a kind of casing tube type gas
Electric heater unit.
Background technology
Gas heater is that one kind uses extensive firing equipment, according to the difference of hot gas, can refine and be divided into a lot
Species, common are nitrogen heater, air heater etc., and gas heater has been widely used Aero-Space, weapons
Many research and production test chambers such as industry, chemical engineering industry and institution of higher learning.But in the technical scheme of existing gas electrically heating device
Many gas flow paths using bending design although the gas flow channel comparing through type has prolongation gas flow paths
Effect, but path increase inconspicuous, compare and at most doubled using the passage of through type, heat exchanger effectiveness is still relatively
Low；The structure such as the cross-sectional area of gas flow channel is mostly rectangular, circular or oval in addition or be based on these structures
Distressed structure, air-flow pass through runner when air-flow outside to center distance very long, can contact with calandria outside it, but
Air-flow centre position hardly possible is contacted with calandria, and temperature is difficult to be changed in very short time, causes the gas exporting to be heated not
Uniformly, the gas temperature fluctuation of output is big, and in the air delivering pipeline with pressure, gas flow rate is fast, using above-mentioned electric heater unit
When gas and calandria time of contact just shorter, therefore heat exchanger effectiveness will reduce, and is also just become apparent from using defect.
In addition to above-mentioned technological deficiency, also include the big shortcoming of thermal losses, the heat-insulation layer in common gases electric heater unit rises
Insulation effect, reduces heat and sheds from housing losss, but the housing radial dimension of general heater is all larger, outside setting guarantor
Warm layer finite thickness, the heat of the heating member of concentrated setting is much larger than the heat that the heat-insulation layer of this wall thickness can maintain so that heat
Amount runs off easily at housing, so existing electric heater unit has the problem that is significantly lost.
Content of the invention
The technical problem to be solved in the present invention is the length increasing gas flow channel in the confined space, logical by changing
Road structure is heated evenly realizing gas, reduces and distributes, by housing, the loss that heat causes, it is an object of the invention to provide one
Kind of heat exchanger effectiveness is high, be heated evenly, the electric heater unit for hot gas that heat-insulating property is strong.
The technical solution used in the present invention is: a kind of casing tube type gas electric heater unit, described device include air inlet 1,
Gas outlet 12, housing 13, inner tube 2, outer tube 5, fin 4, heating wire 3, power line intake 6a, power line outlet 6b, thermal insulation
Layer 7, lower perforated plate 8, sagging plate 9, upper end cover 10, upper perforated plate 11, gas outlet 12, housing 13 and bottom end cover 14；Wherein inner tube 2 with
Outer tube 5 is concentric locking collar tube designs, and the external diameter of inner tube 2 is less than the internal diameter of outer tube 5, and fin 4 is fastened in the shape of a spiral in inner tube 2
Outer surface, the outward flange of fin 4 is contacted with the inner surface of outer tube 5, and inner tube 2 outside, fin 4, outer tube 5 inner side constitute an annular
Wound form gas flow；Heating wire 3 is armouring heating wire, and heating wire 3 is along the gap spiral winding between fin 4 two adjacent fins
In the outer surface of inner tube 2, and it is welded to connect with inner tube 2 outer surface, heating wire 3 is placed in wound form gas flow, can be to winding
The gas heating of flowing in formula runner；Housing 13 is in straight-tube shape, which is provided with air inlet 1, gas outlet 12, power line intake
6a, power line outlet 6b, inner tube 2 is fixed on inside housing 13 with the sleeve pipe heater block of outer tube 5 composition by tube sheet, outer tube
It is provided with heat insulation layer 7, air inlet 1 is fixedly connected on housing 13 side, gas outlet 12 and upper end cover between 5 outsides and housing 13 inner side
10 are fixedly connected, and are connected using edge of a knife flange, bottom end cover 14 is welded with housing 13, in inner tube 2 between upper end cover 10 and housing 13
End is fixed on inside housing 13 by upper perforated plate 11, and inner tube 2 lower end is fixed on inside housing 13 by lower perforated plate 8, outer tube 5 upper end
It is fixedly connected with sagging plate 9, outer tube 5 lower end is fixedly connected with lower perforated plate 8.
Further, inner tube 2, outer tube 5, fin 4 are all using austenite heat-resistance steel alloy incoloy 800h, fin 4 bottom
Portion is welded to connect with inner tube 2 outer surface.
Further, fin 4 and outer tube 5 adopt tolerance fit, and fin 4 top is completely attached to outer tube 5 inner surface, fin
Very close to each other between 4 tops and outer tube 5 inner surface, the angle of climb and fin number that fin 4 is wound around, can design heating according to device
The size of power suitably increases or reduces.
The principle of the present invention is:
A kind of present invention casing tube type gas electric heater unit, the flow channel of gas adopts sleeve type structure to design, this set
Pipe is divided into two-layer, and including outer tube 5 and inner tube 2, the internal diameter of outer tube 5 is more than the external diameter of inner tube 2, the space between outer tube 5 and inner tube 2
Spiral wound formula runner is divided into by fin 4；Heating wire 3 is armouring heating wire, and heating wire 3 is wound in inner tube 2 outer surface, and
Weld with inner tube 2 outer surface, the height of heating wire 3 is less than the height of fin 4, and it is wound in the gap between adjacent two fins,
The winding direction of heating wire 3 is identical with fin 4 direction, and inner tube 2, fin 4 and outer tube 5 are all metal materials and using being welded and fixed
Connected mode, heat transmission ability is big, and after heating wire is energized, outer tube 5, fin 4 and inner tube 2 are all rapidly heated, and all become
The heating surface of hot gas, increased the heat exchange area and between gas；Gas enters apparatus of the present invention by air inlet 1, first passes through
Wound form runner downward spiral flowing between outer tube 5 and inner tube 2, during flowing, gas is by outer tube 5 inner surface, fin
4th, the outer surface heating of inner tube 2, gas flow channel length is several times of Straight-through heater so that apparatus of the present invention heating is fast
Degree is faster；Gas reaches behind apparatus of the present invention bottom along wound form runner, by inner tube 2 flows upward inside, in flow process
In heated by inner tube 2 again, eventually through gas outlet flow out.
In apparatus of the present invention, heating wire 3 and inner tube 2, fin 4, outer tube 5 together constitute a bushing type heats, should
Heats is in the form of a column, and passes through upper perforated plate 11, middle tube sheet 9 and lower perforated plate 8 respectively and is fixed on inside housing 13, effluent in outer tube 5
Dynamic is the relatively low gas of the first temperature heating, and heated high-temperature gas is from inner tube 2 internal flow, Ci Zhongjie again
Structure design advantageously reduces the temperature of outer tube 5, and is provided with heat insulation layer between outer tube 5 and housing 13, and heat insulation layer adopts nanometer micro-
Hole adiabator, 1000 DEG C of maximum operation (service) temperature, density 200～400kg/m3, heat conductivity 0.021～0.034w/m.k, have
Effect reduces the radiation loss of apparatus of the present invention external environment, improves the efficiency of heating surface.
Having the prominent advantages that of the present invention employs sleeve type structure design, and helical fin and sleeve pipe constitute winding stream
Road, increases the heating surface (area) (HS of this electric heater unit and the flow channel length of gas, and firing rate is fast, and gas is heated evenly；Enter this
First through being wound around flowing outside inner tube, after being heated, high-temperature gas flows the gas of invention device from internal tube, outer tube wall temperature
Degree is relatively low, is provided with heat insulation layer between electric heater unit housing and outer tube simultaneously, reduces radiation loss, improves the heat of device
Efficiency.
Brief description
Fig. 1 is a kind of present invention casing tube type gas electric heater unit structure chart；
Fig. 2 is a kind of present invention casing tube type gas electric heater unit sleeve structure detail drawing.
In figure: 1 is air inlet；2 is inner tube；3 is heating wire；4 is fin；5 is outer tube；6a is power line intake；6b
For power line outlet；7 is heat insulation layer；8 is lower perforated plate；9 is sagging plate；10 is upper end cover；11 is upper perforated plate；12 is to give vent to anger
Mouthful；13 is housing；14 is bottom end cover.
Specific embodiment
Below in conjunction with the accompanying drawings and specific embodiment further illustrates the present invention.
As shown in figure 1, the present invention is a kind of casing tube type gas electric heater unit, it is particularly well-suited to the gas pipeline with pressure
In, swiftly flowing gas is heated, below in conjunction with the accompanying drawings the present invention is described further.A kind of casing tube type gas electricity
Heater, including air inlet 1, inner tube 2, heating wire 3, fin 4, outer tube 5, power line intake 6a, power line outlet 6b,
Heat insulation layer 7, lower perforated plate 8, sagging plate 9, upper end cover 10, upper perforated plate 11, gas outlet 12, housing 13 and bottom end cover 14.
A kind of present invention casing tube type gas electric heater unit, the flow channel of gas adopts sleeve type structure to design, this set
Pipe is divided into two-layer, and including outer tube 5 and inner tube 2, the internal diameter of outer tube 5 is more than the external diameter of inner tube 2, the space between outer tube 5 and inner tube 2
Spiral wound formula runner is divided into by fin 4, fin 4 and outer tube 5 adopt tolerance fit, fin 4 top and outer tube 5 inner surface
Completely attach to, very close to each other between fin 4 top and outer tube 5 inner surface；Heating wire 3 is armouring heating wire, and heating wire 3 is wound in
Inner tube 2 outer surface, and weld with inner tube 2 outer surface, the height of heating wire 3 is less than the height of fin 4, is wound in adjacent two fins
Gap between, the winding direction of heating wire 3 is identical with fin 4 direction, and inner tube 2, fin 4 and outer tube 5 are austenite heat-resistance
Steel alloy incoloy 800h material, and adopt welding connecting mode, heat conductivity is big, after heating wire is energized, outer tube 5, wing
Piece 4 and inner tube 2 programming rate are fast, all become the heating surface of hot gas, increased the heat exchange area and between gas；Gas by
Air inlet 1 enters electric heater unit of the present invention, and gas first passes through the wound form runner downward spiral stream between outer tube 5 and inner tube 2
Dynamic, during flowing, gas is by outer tube 5 inner surface, fin 4, the outer surface heating of inner tube 2, wound form gas flow length
It is several times of through type electric heater so that apparatus of the present invention firing rate is fast；Gas reaches apparatus of the present invention along being wound around runner
Behind bottom, by inner tube 2 flows upward inside, heated by inner tube 2 again in flow process, flow out this eventually through gas outlet
Invention device.
As shown in Fig. 2 heating wire 3 and inner tube 2, fin 4, outer tube 5 together constitute a bushing type in apparatus of the present invention
Heats, this heats is in the form of a column, and passes through upper perforated plate 11, middle tube sheet 9 and lower perforated plate 8 respectively and is fixed on inside housing 13,
Outer tube 5 inner side flowing is the relatively low gas of the first temperature heating, and heated high-temperature gas is inside inner tube 2 again
Flowing, this kind of structure design is conducive to making outer tube 5 be in relatively low temperature, and between outer tube 5 outside and housing 13 inner side
It is filled with heat insulation layer 7, heat insulation layer 7 adopts nanometer micropore adiabator, 1000 DEG C of maximum operation (service) temperature, density 200～400kg/
m3, heat conductivity 0.021～0.034w/m.k, effectively reduce the radiation loss of apparatus of the present invention external environment, improve
The device efficiency of heating surface.
Claims (3)
1. a kind of casing tube type gas electric heater unit it is characterised in that: described device includes air inlet (1), gas outlet (12), shell
Body (13), inner tube (2), outer tube (5), fin (4), heating wire (3), power line intake (6a), power line outlet (6b), absolutely
Thermosphere (7), lower perforated plate (8), sagging plate (9), upper end cover (10), upper perforated plate (11), gas outlet (12), housing (13) and lower end
Lid (14)；Wherein inner tube (2) and outer tube (5) are concentric locking collar tube designs, and the external diameter of inner tube (2) is less than the internal diameter of outer tube (5), wing
Piece (4) is fastened in the shape of a spiral in inner tube (2) outer surface, and the outward flange of fin (4) is contacted with the inner surface of outer tube (5), interior
A ring-wound formula gas flow is constituted outside pipe (2), inside fin (4), outer tube (5)；Heating wire (3) is armouring electric heating
Silk, heating wire (3) is helically wound around the outer surface of inner tube (2) along the gap between fin (4) two adjacent fins, and and inner tube
(2) outer surface is welded to connect, and heating wire (3) is placed in wound form gas flow, to the gas flowing through in wound form gas flow
Heating；Housing (13) is in straight-tube shape, which is provided with air inlet (1), gas outlet (12), power line intake (6a), power line draw
Outlet (6b), the sleeve pipe heater block that inner tube (2) and outer tube (5) form is fixed on housing (13) inside, outer tube (5) by tube sheet
It is provided with heat insulation layer (7), air inlet (1) is fixedly connected on housing (13) side, gas outlet between inside outside and housing (13)
(12) it is fixedly connected with upper end cover (10), be connected using edge of a knife flange between upper end cover (10) and housing (13), bottom end cover (14)
With housing (13) welding, housing (13) inside is fixed on by upper perforated plate (11) in inner tube (2) upper end, under inner tube (2) lower end is passed through
Tube sheet (8) is fixed on that housing (13) is internal, and outer tube (5) upper end is fixedly connected with sagging plate (9), outer tube (5) lower end and down tube
Plate (8) is fixedly connected.
2. a kind of casing tube type gas electric heater unit according to claim 1 it is characterised in that: inner tube (2), outer tube (5),
All using austenite heat-resistance steel alloy incoloy 800h, fin (4) bottom is welded to connect fin (4) with inner tube (2) outer surface.
3. a kind of casing tube type gas electric heater unit according to claim 1 it is characterised in that: fin (4) top with outer
Very close to each other, the angle of climb and fin number that fin (4) is wound around between the inner surface of pipe (5), can be according to heater power demand
Appropriateness increases or reduces.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610727998.4A CN106369819B (en) | 2016-08-25 | 2016-08-25 | A kind of casing tube type gas electric heater unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610727998.4A CN106369819B (en) | 2016-08-25 | 2016-08-25 | A kind of casing tube type gas electric heater unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106369819A true CN106369819A (en) | 2017-02-01 |
| CN106369819B CN106369819B (en) | 2019-04-05 |
Family
ID=57878747
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610727998.4A Expired - Fee Related CN106369819B (en) | 2016-08-25 | 2016-08-25 | A kind of casing tube type gas electric heater unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106369819B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109668317A (en) * | 2017-10-13 | 2019-04-23 | 天津市华赛尔气体有限公司 | A kind of continous way gas-heating apparatus |
| CN110385006A (en) * | 2018-04-23 | 2019-10-29 | 宜兴市宜轻机械有限公司 | A kind of Novel condensation exhaust gas removal mechanism |
| CN110999563A (en) * | 2018-07-06 | 2020-04-10 | 获劳动红旗勋章和Czsr劳动勋章的水压试验设计院联合股份公司 | Tubular electric heater equipment unit |
| CN113310211A (en) * | 2021-05-08 | 2021-08-27 | 中国核电工程有限公司 | Pit type gas heater and radioactive factory building system |
| CN113346626A (en) * | 2021-05-17 | 2021-09-03 | 西安交通大学 | Compressed air energy storage system with quick response module and operation method thereof |
| CN113834213A (en) * | 2021-09-18 | 2021-12-24 | 湖南骅骝新材料有限公司 | High-efficient safe high pressure nitrogen heater |
| CN118007107A (en) * | 2024-04-09 | 2024-05-10 | 北京凯德石英股份有限公司 | Art pipe |
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| CN201291589Y (en) * | 2008-11-19 | 2009-08-19 | 周燕 | Inverse air intake hot air gun of hot melt sealing machine for plastic product |
| CN102840676A (en) * | 2012-09-19 | 2012-12-26 | 张剑锋 | Instant heating type electromagnetic water heater heating element with safe, efficient, and low electromagnetic radiation |
| CN103759406A (en) * | 2014-01-24 | 2014-04-30 | 陈国良 | Single-tank, double-pipe and bidirectional electric heating device and air energy instant electric water heater |
| US20140374409A1 (en) * | 2013-06-19 | 2014-12-25 | Behr Gmbh & Co. Kg | Heater |
| CN204612135U (en) * | 2015-01-24 | 2015-09-02 | 吴新祥 | Water heater and the heat radiation comprised thereof utilize structure |
| CN204665658U (en) * | 2015-05-20 | 2015-09-23 | 河南莱帕克化工设备制造有限公司 | A kind of bushing type electric heater |
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2016
- 2016-08-25 CN CN201610727998.4A patent/CN106369819B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201291589Y (en) * | 2008-11-19 | 2009-08-19 | 周燕 | Inverse air intake hot air gun of hot melt sealing machine for plastic product |
| CN102840676A (en) * | 2012-09-19 | 2012-12-26 | 张剑锋 | Instant heating type electromagnetic water heater heating element with safe, efficient, and low electromagnetic radiation |
| US20140374409A1 (en) * | 2013-06-19 | 2014-12-25 | Behr Gmbh & Co. Kg | Heater |
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| CN204612135U (en) * | 2015-01-24 | 2015-09-02 | 吴新祥 | Water heater and the heat radiation comprised thereof utilize structure |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109668317A (en) * | 2017-10-13 | 2019-04-23 | 天津市华赛尔气体有限公司 | A kind of continous way gas-heating apparatus |
| CN110385006A (en) * | 2018-04-23 | 2019-10-29 | 宜兴市宜轻机械有限公司 | A kind of Novel condensation exhaust gas removal mechanism |
| CN110999563A (en) * | 2018-07-06 | 2020-04-10 | 获劳动红旗勋章和Czsr劳动勋章的水压试验设计院联合股份公司 | Tubular electric heater equipment unit |
| CN113310211A (en) * | 2021-05-08 | 2021-08-27 | 中国核电工程有限公司 | Pit type gas heater and radioactive factory building system |
| CN113346626A (en) * | 2021-05-17 | 2021-09-03 | 西安交通大学 | Compressed air energy storage system with quick response module and operation method thereof |
| CN113834213A (en) * | 2021-09-18 | 2021-12-24 | 湖南骅骝新材料有限公司 | High-efficient safe high pressure nitrogen heater |
| CN113834213B (en) * | 2021-09-18 | 2022-08-26 | 湖南骅骝新材料有限公司 | High-efficient safe high pressure nitrogen heater |
| CN118007107A (en) * | 2024-04-09 | 2024-05-10 | 北京凯德石英股份有限公司 | Art pipe |
| CN118007107B (en) * | 2024-04-09 | 2024-06-14 | 北京凯德石英股份有限公司 | Art pipe |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106369819B (en) | 2019-04-05 |
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Granted publication date: 20190405 |