CN110044170A - Heat pipe type spiral heating device - Google Patents
Heat pipe type spiral heating device Download PDFInfo
- Publication number
- CN110044170A CN110044170A CN201810033289.5A CN201810033289A CN110044170A CN 110044170 A CN110044170 A CN 110044170A CN 201810033289 A CN201810033289 A CN 201810033289A CN 110044170 A CN110044170 A CN 110044170A
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- Prior art keywords
- heat
- pipe
- metal tube
- conducting
- heat pipe
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
- F26B23/10—Heating arrangements using tubes or passages containing heated fluids, e.g. acting as radiative elements; Closed-loop systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Drying Of Solid Materials (AREA)
Abstract
A kind of heat pipe type spiral heating device of the present invention includes heat pipe, heat conducting pipe.What heat conducting pipe arranged in the shape of a spiral.Heat pipe includes metal tube, heat-conducting work medium, fin.Fin and metal tube be it is integrated, heat-conducting work medium is in the pipe for the metal tube that both ends seal.The lower end of metal tube and heat conducting pipe are fixed as one.What the thermally conductive heat exchange of the heat-conducting work medium in metal tube utilized is heat pipe for thermal conductivity technology, and thermal energy is by the liquid-gas phase transition of heat-conducting work medium come thermally conductive heat exchange.The heat conducting pipe of helical arrangement can be to avoid the tensile failure for causing heat conducting pipe of expanding with heat and contract with cold；Because each heat pipe is an individual integral solder in the outside of heat conducting pipe, when a heat pipe damage occurs and generates leakage in heat pipe type spiral heating device, the use of entire heat pipe type spiral heating device is not influenced.Heat pipe type spiral heating device can carry out thermally conductive heating to material, can also play the role of pushing ahead material when dry materials work, stir.
Description
Technical field
The present invention relates to a kind of heating devices, are particularly used for the heat pipe type spiral that mating roller drying machine uses and add
Thermal.
Background technique
In the processings fields such as present grain, food, chemical industry, medicine, agricultural and sideline product, herbage, need to material into
The processing of row heat drying；The hot wind that roller drying machine uses all be by equipment outside heat exchanger heat exchange hot wind, thermal energy changes
The thermal efficiency is low, and the use of thermal energy is disposably that the availability of thermal energy is low, and baking needed thermal energy is increased by very much, influences
The drying moisture of drying materials is uneven.
Roller drying machine is thermally dried processing to material under vacuum conditions, to reach necessary requirement water content standard
Material；It is heated under vacuum state, because carrying out convective heat transfer without enough air, liquid, heat transfer, hot spoke under vacuum state
The heat transfer effect penetrated can be more preferable；The heat conduction and heat radiation of vacuum dryer currently on the market is mostly with the heating of external interlayer, comb
Formula radiator carries out heat dissipation heating, but their radiator volume is big, heat dissipation area is small, and thermal energy service efficiency is low, uses
High failure rate in journey, it is not easy to repair.
Hot pipe technique is that one kind of the G.M.Grover invention of LosAlamos National Laboratory, the U.S. in 1963 is known as " heat
The heat transfer element of pipe ", it takes full advantage of the quick thermal transport property of heat-conduction principle and refrigeration filling, will generate heat through heat pipe
The heat of object is transmitted to outside heat source rapidly, and the capacity of heat transmission is more than the capacity of heat transmission of any known metal.
Summary of the invention
The problem to be solved in the present invention is to overcome deficiency existing for existing heating device technology, is provided a kind of for mating rolling
The heat pipe type spiral heating device that cylinder drier uses.
In order to reach above-mentioned purpose, what the present invention was achieved through the following technical solutions: heat pipe type spiral heating device includes
Heat pipe, heat conducting pipe.
The heat conducting pipe is the pipe of metal production, what heat conducting pipe arranged in the shape of a spiral.
The diameter of the heat conducting pipe is 15-48mm, and the length of heat conducting pipe is 2000-28000mm.
The screw diameter of spiral helicine heat conducting pipe is 1200-2800mm, and the helix length of spiral helicine heat conducting pipe is
3500—28000mm。
The heat conducting pipe has thermally conductive import and catheter outlet.
The heat pipe includes metal tube, heat-conducting work medium, fin.
The fin is fixed on the tube wall exterior of metal tube, and fin and metal tube are integrated；Fin is for increasing heat
The heat dissipation area of pipe improves thermally conductive, the radiating rate of the thermal energy of heat pipe.
The thickness of the fin is 0.2-3mm；The height of fin is 10-30mm, and the spacing of fin and fin is
18—60mm。
Thickness, the height of fin are designed according to the Thermal Conductivity by Using of fin；The thickness of fin is 0.2-3mm, fin
10-30mm of height are that have relationship according to the heat transfer of the high temperature heat conducting medium in heat conducting pipe, and too low fin height influences heat
The conduction surface of energy is limited, and the conduction that excessively high fin height influences thermal energy is not got on.
The spacing of the fin and fin be 18-50mm be according to the principle of D > 4d (D is the spacing of fin and fin,
D is the diameter of material), so the optimum distance between fin and fin is less than four times of diameter of length of material, in this way may be used
To guarantee that the material in the rotary course of roller drying storehouse would not be stuck between fin.
The heat-conducting work medium is in the pipe for the metal tube that both ends seal.
What the thermally conductive heat exchange of the heat-conducting work medium in the metal tube of the heat pipe utilized is heat pipe for thermal conductivity technology, and thermal energy is logical
The liquid-gas phase transition for crossing heat-conducting work medium carrys out thermally conductive heat exchange.
The heat-conducting work medium is water ether or composite work medium.
The diameter of the metal tube is 15-48mm, and the height of metal tube is 280-1200mm.
The lower end of the metal tube is concave shape；The concave shape lower end of metal tube is fitted in the upper surface of heat conducting pipe, gold
Belong to pipe lower end to be fixed by welding on the pipe face of heat conducting pipe, the lower end of metal tube and heat conducting pipe are fixed as one.
Concave shape lower end of the thermal energy by heat transfer to metal tube in heat conducting pipe pipe carries out thermally conductive heating.
The lower end of the metal tube is the evaporator section of heat-conducting work medium, and the tube wall of metal tube is the condensation segment of heat-conducting work medium.
The heat pipe is an individual integral solder in the outside of heat conducting pipe, and being fixed on for heat pipe arrangement is spiral helicine
On heat conducting pipe.
The spacing of the heat pipe and heat pipe is 50-120mm.
When the height of heat pipe is more than 350mm, fixation is respectively welded by fixed strip in the upper end of the metal tube of heat pipe, heat pipe with
Support is fixedly connected with by fixed strip between heat pipe.By the fixed heat pipe of fixed strip support increase the lower end of the metal tube of heat pipe with
The connection solidness of heat conducting pipe, the lower end for reducing metal tube are detached from the hidden danger of heat conducting pipe under the effect of external force, improve heat
The service life of pipe；Fixed strip is metal strip.
The heat pipe is an individual integral solder in the outside of heat conducting pipe；The inside of heat pipe and the inside of heat conducting pipe
It is not communicated with；Leakage is generated when damage occurs in a certain heat pipe, does not influence the use of entire radiator.
Heat pipe type spiral heating device is mounted on the inside in roller drying storehouse, and the heat conducting pipe of heat pipe type spiral heating device is solid
It is scheduled on the warehouse inside roller drying storehouse, heat pipe type spiral heating device rotates together with the synchronization of roller drying storehouse.
The heat conducting pipe of helical arrangement can lead to avoid the tensile failure for causing heat conducting pipe of expanding with heat and contract with cold, heat conducting pipe unstability
The problems such as heat pipe is pulled from warehouse can not only reduce the axial load of roller drying storehouse and heat conducting pipe, and it is swollen to reduce heat
Pipe stress caused by swollen difference.
When heat pipe type spiral heating device and roller drying storehouse rotate together with, when the lower end of the metal tube of heat pipe is downward,
After heat-conducting work medium in the metal tube of heat pipe flows to the lower end of metal tube, the thermal energy that the heat-conducting medium in heat conducting pipe pipe carries is through leading
Lower end of the tube wall of heat pipe by heat transfer to metal tube carries out thermally conductive heating.
The workflow of the thermally conductive heating of heat pipe type spiral heating device is as follows:
One, the heat-conducting medium for carrying thermal energy is entered in heat conducting pipe by the thermally conductive import of heat conducting pipe.
Two, tube wall of the thermal energy that the heat-conducting medium in heat conducting pipe pipe carries through heat conducting pipe is by heat transfer to the metal of heat pipe
The lower end of pipe carries out thermally conductive heating；Thermal energy is mentioned by the lower end of metal tube to the liquid heat-conducting work medium in the metal tube of heat pipe
Thermal energy is supplied.
Three, thermal energy makes liquid heat-conducting work medium Quick-gasifying on the lower end of metal tube, the heat-conducting work medium movement after gasification
In the metal tube cavity of heat pipe, after the outside heat conduction and heat radiation of tube wall, fin that the heat-conducting work medium after gasification passes through metal tube, gasification
Heat-conducting work medium afterwards is condensed into liquid heat-conducting work medium, and condensed liquid heat-conducting work medium flows to the metal tube of heat pipe
Heat gasifies again after at lower end, and heat-conducting work medium completes the thermally conductive heat exchange cycle in heat pipe by gas-liquid phase transition.
Four, thermal energy is heated by metal tube, the heat transfer of fin, heat radiation to the material thermal conductivity around heat pipe, and material obtains
Thermal energy has been arrived, dry drying has been carried out, reaches the material of necessary requirement water content standard.
Five, heat pipe type spiral heating device can carry out thermally conductive heating to material, can also play and work in dry materials
When material is pushed ahead, is stirred effect.
Six, the heat-conducting medium after heat conduction and heat radiation excludes heat conducting pipe by the catheter outlet of heat conducting pipe, and heat-conducting medium passes through outer
If heating devices heat after, enter in heat conducting pipe again by the thermally conductive import of heat conducting pipe, recycle again and again in this way
It is thermally conductive, it exchanges heat, heating.
The present invention has the advantages that compared with existing heating device: a kind of hot-cast socket of heat pipe type spiral heating device
High-efficient, in the case where the spatial volume of same size, heat dissipation area increases 8-30 times, is conducive to the heat transfer of thermal energy
Heat radiation, expands the radiating rate of thermal energy, and thermal energy is obtained heat conduction and heat radiation well.The heat conducting pipe of helical arrangement can be kept away
Exempt to expand with heat and contract with cold and causes the tensile failure of heat conducting pipe；Because each heat pipe is an individual integral solder in the outer of heat conducting pipe
Face does not influence entire heat pipe type spiral heating when a heat pipe appearance damage generation leakage in heat pipe type spiral heating device
The use of device.Heat pipe type spiral heating device can carry out thermally conductive heating to material, can also play and work in dry materials
When material is pushed ahead, is stirred effect.
Detailed description of the invention:
Fig. 1, for heat pipe type spiral heating device of the present invention heat conducting pipe helical structure schematic diagram；
Fig. 2, for the schematic cross-sectional view of heat pipe type spiral heating device of the present invention.
Specific embodiment:
The present invention is described further with reference to the accompanying drawings and examples.
Embodiment:
Heat pipe type spiral heating device as shown in Figure 1 and Figure 2 includes heat pipe 2, heat conducting pipe 1.
The heat conducting pipe 1 is the pipe of metal production, what heat conducting pipe 1 arranged in the shape of a spiral.
The diameter of the heat conducting pipe 1 is 38mm, and the length of heat conducting pipe 1 is 18000mm.
The screw diameter of spiral helicine heat conducting pipe 1 is 1800mm, and the helix length of spiral helicine heat conducting pipe 1 is 6000mm.
The heat conducting pipe 1 has thermally conductive import 5 and catheter outlet 6.
The heat pipe 2 includes metal tube 7, heat-conducting work medium 4, fin 3.
The fin 3 is fixed on the tube wall exterior of metal tube 7, and fin 3 and metal tube 7 are integrated；Fin 3 is for increasing
The heat dissipation area of heating tube 2 improves thermally conductive, the radiating rate of the thermal energy of heat pipe 2.
The thickness of the fin 3 is 1mm；The height of fin 3 is 15mm, and the spacing of fin 3 and fin 3 is 40mm.
Thickness, the height of fin 3 are designed according to the Thermal Conductivity by Using of fin 3；The thickness of fin 3 is 1mm, fin 3
The 15mm of height is that have relationship according to the heat transfer of the high temperature heat conducting medium in heat conducting pipe 1, and too low fin 3 highly influences thermal energy
Conduction surface it is limited, the conduction that excessively high fin 3 highly influences thermal energy is not got on.
The spacing of the fin 3 and fin 3 be 50mm be according to the principle of D > 4d (D is the spacing of fin 3 Yu fin 3,
D is the diameter of material), so the optimum distance between fin 3 and fin 3 is less than four times of diameter of length of material, in this way
It can guarantee that the material in the rotary course of roller drying storehouse would not be stuck between fin 3.
The heat-conducting work medium 4 is in the pipe for the metal tube 7 that both ends seal.
What the thermally conductive heat exchange of the heat-conducting work medium 4 in the metal tube 7 of the heat pipe 2 utilized is heat pipe for thermal conductivity technology, thermal energy
It is by the liquid-gas phase transition of heat-conducting work medium 4 come thermally conductive heat exchange.
The heat-conducting work medium 4 is composite work medium.
The diameter of the metal tube 7 is 35mm, and the height of metal tube 7 is 400mm.
The lower end 9 of the metal tube 7 is concave shape；The concave shape lower end 9 of metal tube 7 is fitted in the upper of heat conducting pipe 1
Face, 7 lower end 9 of metal tube are fixed by welding on the pipe face of heat conducting pipe 1, and the lower end 9 of metal tube 7 and heat conducting pipe 1 are fixed as one
Body.
Thermal energy in 1 pipe of heat conducting pipe carries out thermally conductive heating to the lower end 9 of metal tube 7 by heat transfer.
What the thermally conductive heat exchange of the heat-conducting work medium 4 in the metal tube 7 of the heat pipe 2 utilized is the thermally conductive technology of heat pipe 2, thermal energy
It is by the liquid-gas phase transition of heat-conducting work medium 4 come thermally conductive heat exchange.
The lower end 9 of the metal tube 7 is the evaporator section of heat-conducting work medium 4, and the tube wall of metal tube 7 is the cold of heat-conducting work medium 4
Solidifying section.
The heat pipe 2 is an individual integral solder in the outside of heat conducting pipe 1, and what heat pipe 2 arranged is fixed on spiral
On the heat conducting pipe 1 of shape.
The spacing of the heat pipe 2 and heat pipe 2 is 60mm.
Fixation is respectively welded by fixed strip on the upper end 8 of the metal tube 7 of heat pipe 2, by fixed strip between heat pipe 2 and heat pipe 2
It is fixedly connected with support.The lower end 9 of metal tube 7 is increased by the fixed heat pipe 2 of fixed strip support and the connection of heat conducting pipe 1 is firm
Degree, the lower end 9 for reducing metal tube 7 is detached from the hidden danger of heat conducting pipe 1 under the effect of external force, improves the service life of heat pipe 2.
The heat pipe 2 is an individual integral solder in the outside of heat conducting pipe 1；The inside of heat pipe 2 and heat conducting pipe 1
Inside is not communicated with；Leakage is generated when damage occurs in a certain heat pipe 2, does not influence the use of entire radiator.
Heat pipe type spiral heating device is mounted on the inside in roller drying storehouse, the heat conducting pipe 1 of heat pipe type spiral heating device
It is fixed on the warehouse inside roller drying storehouse, heat pipe type spiral heating device rotates together with the synchronization of roller drying storehouse.
When heat pipe type spiral heating device and roller drying storehouse rotate together, when the lower end 9 of the metal tube 7 of heat pipe 2 is downward,
After heat-conducting work medium 4 in the metal tube 7 of heat pipe 2 flows to the lower end 9 of metal tube 7, the heat of the heat-conducting medium carrying in 1 pipe of heat conducting pipe
Thermally conductive heating can be carried out to the lower end 9 of metal tube 7 by heat transfer through the tube wall of heat conducting pipe 1.
The workflow of the thermally conductive heating of heat pipe type spiral heating device is as follows:
One, the heat-conducting medium for carrying thermal energy is entered in heat conducting pipe 1 by the thermally conductive import 5 of heat conducting pipe 1.
Two, tube wall of the thermal energy that the heat-conducting medium in 1 pipe of heat conducting pipe carries through heat conducting pipe 1 is by heat transfer to heat pipe 2
The lower end 9 of metal tube 7 carries out thermally conductive heating；Thermal energy is by the lower end 9 of metal tube 7 to liquid in the metal tube 7 of heat pipe 2
Heat-conducting work medium 4 provides thermal energy.
Three, thermal energy makes liquid 4 Quick-gasifying of heat-conducting work medium, the heat-conducting work medium 4 after gasification on the lower end 9 of metal tube 7
In 7 inner cavity of metal tube of heat pipe 2, the heat-conducting work medium 4 after gasification is thermally conductive outward by the tube wall and fin 3 of metal tube 7 for movement
After heat dissipation, the heat-conducting work medium 4 after gasification is condensed into liquid heat-conducting work medium 4, and condensed liquid heat-conducting work medium 4 flows to
Heat gasifies again after at the lower end 9 of the metal tube 7 of heat pipe 2, and heat-conducting work medium 4 completes leading in heat pipe 2 by liquid-gas phase transition
Hot heat exchange cycle.
Four, thermal energy is heated by metal tube 7, the heat transfer of fin 3, heat radiation to the material thermal conductivity around heat pipe 2, material
Thermal energy has been obtained, dry drying has been carried out, reaches the material of necessary requirement water content standard.
Five, heat pipe type spiral heating device can carry out thermally conductive heating to material, can also play and work in dry materials
When material is pushed ahead, is stirred effect.
Six, the heat-conducting medium after heat conduction and heat radiation excludes heat conducting pipe 1 by the catheter outlet 6 of heat conducting pipe 1, and heat-conducting medium passes through
After the heating devices heat of peripheral hardware, enters in heat conducting pipe 1 again by the thermally conductive import 5 of heat conducting pipe 1, follow again and again in this way
Ring it is thermally conductive, exchange heat, heating.
Above embodiments are merely used to help understand production method and its core concept of the invention, and specific implementation is not limited to
In above-mentioned specific embodiment, those skilled in the art from the above idea, without creative labor, is made
Variation all fall within protection scope of the present invention.
Claims (6)
1. a kind of heat pipe type spiral heating device, including heat pipe (2), heat conducting pipe (1)；It is characterized by: heat conducting pipe (1) is helically
Shape arrangement；
The heat conducting pipe (1) has thermally conductive import (5) and catheter outlet (6)；
The heat pipe (2) includes metal tube (7), heat-conducting work medium (4), fin (3)；
The fin (3) is fixed on the tube wall exterior of metal tube (7), and fin (3) and metal tube (7) are integrated, thermally conductive works
Matter (4) is in the pipe for the metal tube (7) that both ends seal；The thermally conductive heat exchange of heat-conducting work medium (4) in the metal tube (7) of heat pipe (2)
What is utilized is heat pipe for thermal conductivity technology, and thermal energy is the liquid-gas phase transition by heat-conducting work medium (4) come thermally conductive heat exchange；Metal tube (7)
Lower end (9) is the evaporator section of heat-conducting work medium (4), and the tube wall of metal tube (7) is the condensation segment of heat-conducting work medium (4)；
The lower end (9) of the metal tube (7) is concave shape；The lower end (9) of metal tube (7) and heat conducting pipe (1) are fixed as one
Body；
The heat pipe (2) is an individual integral solder in the outside of heat conducting pipe (1), and heat pipe (2) arrangement is fixed on spiral shell
On the heat conducting pipe (1) for revolving shape；When the height of heat pipe (2) is more than 350mm, on the upper end (8) of the metal tube (7) of heat pipe (2) by
Fixation is respectively welded in fixed strip；
Heat-conducting work medium (4) when the lower end (9) of the metal tube (7) of the heat pipe (2) is downward, in the metal tube (7) of heat pipe (2)
After flowing to the lower end (9) of metal tube (7), tube wall of the thermal energy through heat conducting pipe (1) that the heat-conducting medium in heat conducting pipe (1) pipe carries is logical
The lower end (9) that overheat is conducted to metal tube (7) carries out thermally conductive heating.
2. a kind of heat pipe type spiral heating device according to claim 1, it is characterised in that: spiral helicine heat conducting pipe (1)
Screw diameter be 1200-2800mm, the helix length of spiral helicine heat conducting pipe (1) is 3500-28000mm.
3. a kind of heat pipe type spiral heating device according to claim 1, it is characterised in that: the thickness of fin (3) is
0.2—3mm；The height of fin (3) is 10-30mm, and the spacing of fin (3) and fin (3) is 18-60mm.
4. a kind of heat pipe type spiral heating device according to claim 1, it is characterised in that: the diameter of metal tube (7) is
15-48mm, the height of metal tube (7) are 280-1200mm.
5. a kind of heat pipe type spiral heating device according to claim 1, it is characterised in that: heat-conducting work medium (4) is water, or
Person is ether or composite work medium.
6. a kind of heat pipe type spiral heating device according to claim 1, it is characterised in that: heat pipe (2) and heat pipe (2)
Spacing is 50-120mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810033289.5A CN110044170A (en) | 2018-01-14 | 2018-01-14 | Heat pipe type spiral heating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810033289.5A CN110044170A (en) | 2018-01-14 | 2018-01-14 | Heat pipe type spiral heating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110044170A true CN110044170A (en) | 2019-07-23 |
Family
ID=67272666
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810033289.5A Withdrawn CN110044170A (en) | 2018-01-14 | 2018-01-14 | Heat pipe type spiral heating device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110044170A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112779528A (en) * | 2020-12-02 | 2021-05-11 | 山东锦恒环保设备有限公司 | Processing and manufacturing process of vacuum superconducting tube |
| CN114264166A (en) * | 2020-12-29 | 2022-04-01 | 无锡朗秀科技有限公司 | Heat exchanger of oven |
-
2018
- 2018-01-14 CN CN201810033289.5A patent/CN110044170A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112779528A (en) * | 2020-12-02 | 2021-05-11 | 山东锦恒环保设备有限公司 | Processing and manufacturing process of vacuum superconducting tube |
| CN114264166A (en) * | 2020-12-29 | 2022-04-01 | 无锡朗秀科技有限公司 | Heat exchanger of oven |
| CN114264166B (en) * | 2020-12-29 | 2024-01-02 | 无锡朗秀科技有限公司 | Oven heat exchanger |
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| PB01 | Publication | ||
| PB01 | Publication | ||
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| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20190723 |