CN116251730A - Preparation method of far infrared invisible light-free black nano coating quartz heating pipe - Google Patents
Preparation method of far infrared invisible light-free black nano coating quartz heating pipe Download PDFInfo
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- CN116251730A CN116251730A CN202211099291.5A CN202211099291A CN116251730A CN 116251730 A CN116251730 A CN 116251730A CN 202211099291 A CN202211099291 A CN 202211099291A CN 116251730 A CN116251730 A CN 116251730A
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- quartz glass
- glass tube
- far infrared
- black nano
- quartz
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 80
- 238000010438 heat treatment Methods 0.000 title claims abstract description 51
- 239000010453 quartz Substances 0.000 title claims abstract description 28
- 239000002103 nanocoating Substances 0.000 title claims abstract description 13
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 239000011248 coating agent Substances 0.000 claims abstract description 20
- 238000000576 coating method Methods 0.000 claims abstract description 20
- 230000017525 heat dissipation Effects 0.000 claims abstract description 19
- 238000005485 electric heating Methods 0.000 claims abstract description 17
- 239000003973 paint Substances 0.000 claims abstract description 8
- 238000005507 spraying Methods 0.000 claims abstract description 8
- 238000001035 drying Methods 0.000 claims abstract description 5
- 238000004140 cleaning Methods 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims abstract description 4
- 238000004321 preservation Methods 0.000 claims abstract description 4
- 238000011282 treatment Methods 0.000 claims abstract description 4
- 239000000919 ceramic Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- 229910001220 stainless steel Inorganic materials 0.000 claims description 10
- 239000010935 stainless steel Substances 0.000 claims description 10
- 230000001681 protective effect Effects 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 239000003085 diluting agent Substances 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 abstract description 3
- 230000001070 adhesive effect Effects 0.000 abstract description 3
- 239000000203 mixture Substances 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 3
- 238000000554 physical therapy Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 238000009941 weaving Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/002—Pretreatement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0254—After-treatment
- B05D3/0272—After-treatment with ovens
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/12—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by mechanical means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2203/00—Other substrates
- B05D2203/30—Other inorganic substrates, e.g. ceramics, silicon
- B05D2203/35—Glass
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2254/00—Tubes
- B05D2254/02—Applying the material on the exterior of the tube
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Resistance Heating (AREA)
Abstract
The invention discloses a preparation method of a far infrared invisible light-free black nano coating quartz heating tube, which comprises the following steps: s1, selecting a quartz glass tube as an insulating protection carrier of an electric heating device; s2, performing frosting treatment by taking the surface of the quartz glass tube as an adhesion surface; s3, cleaning the quartz glass tube; step S4, drying the quartz glass tube; s5, spraying far infrared black nano heat dissipation paint on the adhesion surface of the quartz glass tube; s6, placing the mixture into a 700 ℃ oven for heat preservation and baking for 4 hours; s7, preserving heat for 2 hours; s8, assembling an electric heating tube assembly on the quartz glass tube to form a heating tube; and S9, testing the heating pipe. The invention adopts the frosted quartz glass tube as the carrier of the electric heating device, enhances the adhesive force of the far infrared black nano heat dissipation coating, avoids light leakage caused by falling off after high temperature, runs off far infrared emission heat, saves materials, and has stable coating and high reliability.
Description
Technical Field
The invention relates to the technical field of quartz heating pipes, in particular to a preparation method of a far infrared black nano coating quartz heating pipe without visible light.
Background
The far infrared quartz heating tube is a heating device for generating infrared rays and heating by utilizing the infrared rays, and is widely applied to industrial, agricultural, medical and household appliances, such as dyeing and finishing, weaving, printing, spraying, electroplating, electrochemical treatment, heating and drying of plastics, foods, agricultural products and medicines, heating of household appliances, infrared physiotherapy, high-temperature disinfection of cupboards and the like. After the existing far infrared quartz heating pipe is subjected to high temperature of more than 700 ℃, the far infrared black nano heat dissipation coating falls off to cause light leakage, the phenomena of reddening and glowing of a heating body can occur, the service life is short, and the reliability is low.
Disclosure of Invention
Aiming at the problems existing in the prior art method, the aim of the invention is that: the preparation method of the far infrared black nano coating quartz heating pipe is characterized by being difficult to fall off, large in heat dissipation area, good in heat transfer effect, fast in heating and high in heat efficiency.
The invention provides the following technical scheme: a preparation method of a far infrared black nano coating quartz heating tube without visible light comprises the following steps:
s1, selecting a quartz glass tube as an insulating protection carrier of an electric heating device;
s2, performing frosting treatment by taking the surface of the quartz glass tube as an adhesion surface;
step S3, cleaning the frosted quartz glass tube;
step S4, drying the cleaned quartz glass tube;
s5, spraying far infrared black nano heat dissipation paint on the adhesion surface of the quartz glass tube;
s6, placing the quartz glass tube sprayed with the far infrared black nano heat dissipation coating into a 700 ℃ oven for heat preservation and baking for 4 hours;
s7, preserving heat for 2 hours after baking the quartz glass tube;
s8, assembling an electric heating tube assembly on the quartz glass tube to form a heating tube;
and S9, testing the heating pipe.
Further, in the step S2, the roughness of the adhesion surface of the silica glass tube is 200 to 300 mesh.
Further, in the step S5, the ratio of the spraying material on the adhesion surface of the quartz glass tube is far infrared black nano heat dissipation paint: clear oil: a diluent: curing agent = 3:4:2:1.
further, the electric heating tube component comprises a high-temperature resistant insulating ceramic seat, a stainless steel terminal and an electric heating wire; the high-temperature-resistant insulating ceramic seats are packaged at two ends of the quartz glass tube; the stainless steel terminal is arranged on the end face of the high-temperature-resistant insulating ceramic base; the heating wire is encapsulated in the quartz glass tube; the stainless steel terminal is electrically connected with the heating wire.
Further, the electric heating tube component further comprises a heat reflecting cover, a temperature controller, a switch button, a fan and an insulating protective shell; the fan is arranged between the air inlet of the insulating protective shell and the quartz glass tube port; the fan is used for sending heat generated by the quartz heating pipe to an air outlet of the warmer; the heat reflecting cover is arranged between the insulating protective shell and the quartz glass tube; the method comprises the steps that heat emitted by a far infrared black nano quartz heating pipe without visible light is radiated to an air outlet of a heater, so that the temperature of an inner cavity of the heater is effectively reduced, the reliability and the safety of a product are protected, and the temperature controller is connected with the far infrared black nano quartz heating pipe without visible light of the heater; the switch button is electrically connected with the warmer temperature controller.
Through the technical scheme, compared with the prior art, the invention has the beneficial effects that:
according to the invention, the frosted quartz glass tube is used as a carrier of an electric heating device, so that the adhesive force of the far infrared black nano heat-dissipating coating is enhanced, the far infrared black nano heat-dissipating coating is not easy to fall off, light leakage caused by falling of the far infrared black nano heat-dissipating coating after the high temperature is over 700 ℃ is avoided, the emission heat of far infrared is lost, the use amount of the far infrared black nano heat-dissipating coating is saved by over 50 percent, and the far infrared black nano heat-dissipating coating is stable and high in reliability within 6000 hours; the far infrared black dispersion heat-spreading coating has large heat-spreading area, good heat transfer effect, quick temperature rise and high heat efficiency; the invention has high efficiency, energy saving, fast temperature rise and low heat consumption, and the heating element has no redness and hot phenomenon and long service life, and the far infrared black quartz heating tube produces far infrared radiation with physiotherapy health care function to human body during the working process.
Drawings
For a clearer description of embodiments of the invention or of solutions in the prior art, the drawings that are necessary for the description of the embodiments or of the prior art will be briefly described, it being evident that the drawings in the following description are only some embodiments of the invention, and that other drawings can be obtained, without inventive faculty, by a person skilled in the art from these drawings:
FIG. 1 is a flow chart of a preparation process of a far infrared black nano-coating quartz heating tube;
fig. 2 is a schematic structural diagram of a quartz heating tube with far infrared black nano paint according to an embodiment of the invention.
In the figure: 1. a quartz glass tube; 2. far infrared black nano heat dissipation paint; 3. a high temperature resistant insulating ceramic base; 4. stainless steel terminals; 5. heating wire.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments. For the purpose of providing a more clear description of the objects, aspects and innovations of the present invention, reference will now be made in detail to some, but not all embodiments of the invention, examples of which are illustrated and described herein for purposes of illustration and description, but are not intended to limit the scope of the invention.
It should be noted that, in the present invention, unless explicitly specified and limited otherwise, the term "connected" should be construed broadly, for example, "connected" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
A preparation method of a far infrared black nano coating quartz heating tube without visible light comprises the following steps:
step S1, selecting a quartz glass tube 1 as an insulating protection carrier of an electric heating device;
step S2, polishing the surface of the quartz glass tube 1 serving as an adhesion surface;
step S3, cleaning the frosted quartz glass tube 1;
step S4, drying the cleaned quartz glass tube 1;
step S5, spraying far infrared black nano heat dissipation paint 2 on the adhesion surface of the quartz glass tube 1;
s6, placing the quartz glass tube 1 sprayed with the far infrared black nano heat dissipation coating 2 into a 700 ℃ oven for heat preservation and baking for 4 hours;
step S7, preserving heat for 2 hours after baking the quartz glass tube 1;
s8, assembling an electric heating tube assembly on the quartz glass tube 1 to form a heating tube;
and S9, testing the heating pipe.
Specifically, in the embodiment, in the step S2, the roughness of the adhesion surface of the quartz glass tube 1 is 200 to 300 mesh.
Specifically, in the embodiment, in the step S5, the ratio of the spraying material on the adhesion surface of the quartz glass tube 1 is the far infrared black nano heat dissipation coating 2: clear oil: a diluent: curing agent = 3:4:2:1.
referring to fig. 1, in particular, in this embodiment, the electrothermal tube assembly includes a high-temperature resistant insulating ceramic base 3, a stainless steel terminal 4 and an electrothermal wire 5; the high-temperature-resistant insulating ceramic seats 3 are encapsulated at two ends of the quartz glass tube 1; the stainless steel terminal 4 is arranged on the end face of the high-temperature-resistant insulating ceramic base 3; the heating wire 5 is encapsulated in the quartz glass tube 1; the stainless steel terminal 4 is electrically connected with the heating wire 5.
Specifically, in this embodiment, the electrothermal tube component further includes a heat reflection cover, a temperature controller, a switch button, a fan, and an insulation protection housing; the fan is arranged between the air inlet of the insulating protective shell and the port 1 of the quartz glass tube; the fan is used for sending heat generated by the quartz heating pipe to an air outlet of the warmer; the heat reflecting cover is arranged between the insulating protective shell and the quartz glass tube 1; the method comprises the steps that heat emitted by a far infrared black nano quartz heating pipe without visible light is radiated to an air outlet of a heater, so that the temperature of an inner cavity of the heater is effectively reduced, the reliability and the safety of a product are protected, and the temperature controller is connected with the far infrared black nano quartz heating pipe without visible light of the heater; the switch button is electrically connected with the warmer temperature controller.
Specifically, the technical parameters of the invention are as follows:
compared with the prior art, the invention has the beneficial effects that:
according to the invention, the frosted quartz glass tube 1 is used as a carrier of an electric heating device, so that the adhesive force of the far infrared black nano heat dissipation coating 2 is enhanced, the far infrared black nano heat dissipation coating 2 is not easy to fall off, light leakage caused by falling of the far infrared black nano heat dissipation coating 2 after the high temperature is over 700 ℃ is avoided, the emission heat of far infrared is lost, the use amount of the far infrared black nano heat dissipation coating 2 is saved by over 50%, and the coating of the far infrared black nano heat dissipation coating 2 is stable within 6000 hours, and the reliability is high; the far infrared black dispersion heat-spreading coating has large heat-spreading area, good heat transfer effect, quick temperature rise and high heat efficiency; the invention has high efficiency, energy saving, fast temperature rise and low heat consumption, and the heating element has no redness and hot phenomenon and long service life, and the far infrared black quartz heating tube produces far infrared radiation with physiotherapy health care function to human body during the working process.
The foregoing has described in detail the technical solutions provided by the embodiments of the present invention, and specific examples have been applied to illustrate the principles and implementations of the embodiments of the present invention, where the above description of the embodiments is only suitable for helping to understand the principles of the embodiments of the present invention; meanwhile, as for those skilled in the art, according to the embodiments of the present invention, there are variations in the specific embodiments and the application scope, and the present description should not be construed as limiting the present invention.
Claims (5)
1. The preparation method of the far infrared black nano coating quartz heating tube without visible light is characterized by comprising the following steps of:
s1, selecting a quartz glass tube as an insulating protection carrier of an electric heating device;
s2, performing frosting treatment by taking the surface of the quartz glass tube as an adhesion surface;
step S3, cleaning the frosted quartz glass tube;
step S4, drying the cleaned quartz glass tube;
s5, spraying far infrared black nano heat dissipation paint on the adhesion surface of the quartz glass tube;
s6, placing the quartz glass tube sprayed with the far infrared black nano heat dissipation coating into a 700 ℃ oven for heat preservation and baking for 4 hours;
s7, preserving heat for 2 hours after baking the quartz glass tube;
s8, assembling an electric heating tube assembly on the quartz glass tube to form a heating tube;
and S9, testing the heating pipe.
2. The method for preparing the far infrared non-visible light black nano coating quartz heating tube is characterized by comprising the following steps of: in the step S2, the roughness of the adhesion surface of the quartz glass tube is 200-300 meshes.
3. The method for preparing the far infrared non-visible light black nano coating quartz heating tube is characterized by comprising the following steps of: in the step S5, the ratio of the spraying material on the adhesion surface of the quartz glass tube is far infrared black nano heat dissipation paint: clear oil: a diluent: curing agent = 3:4:2:1.
4. the method for preparing the far infrared non-visible light black nano coating quartz heating tube is characterized by comprising the following steps of: the electric heating tube component comprises a high-temperature resistant insulating ceramic seat, a stainless steel terminal and an electric heating wire; the high-temperature-resistant insulating ceramic seats are packaged at two ends of the quartz glass tube; the stainless steel terminal is arranged on the end face of the high-temperature-resistant insulating ceramic base; the heating wire is encapsulated in the quartz glass tube; the stainless steel terminal is electrically connected with the heating wire.
5. The method for preparing the far infrared non-visible light black nano coating quartz heating tube is characterized by comprising the following steps of: the electric heating tube component further comprises a heat reflecting cover, a temperature controller, a switch button, a fan and an insulating protective shell; the fan is arranged between the air inlet of the insulating protective shell and the quartz glass tube port; the fan is used for sending heat generated by the quartz heating pipe to an air outlet of the warmer; the heat reflecting cover is arranged between the insulating protective shell and the quartz glass tube; the method comprises the steps that heat emitted by a far infrared black nano quartz heating pipe without visible light is radiated to an air outlet of a heater, so that the temperature of an inner cavity of the heater is effectively reduced, the reliability and the safety of a product are protected, and the temperature controller is connected with the far infrared black nano quartz heating pipe without visible light of the heater; the switch button is electrically connected with the warmer temperature controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211099291.5A CN116251730A (en) | 2022-09-07 | 2022-09-07 | Preparation method of far infrared invisible light-free black nano coating quartz heating pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211099291.5A CN116251730A (en) | 2022-09-07 | 2022-09-07 | Preparation method of far infrared invisible light-free black nano coating quartz heating pipe |
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| Publication Number | Publication Date |
|---|---|
| CN116251730A true CN116251730A (en) | 2023-06-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211099291.5A Pending CN116251730A (en) | 2022-09-07 | 2022-09-07 | Preparation method of far infrared invisible light-free black nano coating quartz heating pipe |
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| Country | Link |
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| CN (1) | CN116251730A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2589094Y (en) * | 2002-12-30 | 2003-12-03 | 马荣春 | Short-wave infrared heating pipe |
| CN101951705A (en) * | 2010-08-31 | 2011-01-19 | 广东格兰仕集团有限公司 | Heating pipe |
| CN203464381U (en) * | 2013-09-13 | 2014-03-05 | 广东四会互感器厂有限公司 | Far infrared nano electrothermal film heater comprising quartz glass heating tubes |
| CN205005278U (en) * | 2015-09-22 | 2016-01-27 | 齐偲含 | Quartz capsule far -infrared heating device |
| CN108610984A (en) * | 2017-02-09 | 2018-10-02 | 连云港市英普石英有限公司 | A kind of cumulative electric heating tube coating and production method |
-
2022
- 2022-09-07 CN CN202211099291.5A patent/CN116251730A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2589094Y (en) * | 2002-12-30 | 2003-12-03 | 马荣春 | Short-wave infrared heating pipe |
| CN101951705A (en) * | 2010-08-31 | 2011-01-19 | 广东格兰仕集团有限公司 | Heating pipe |
| CN203464381U (en) * | 2013-09-13 | 2014-03-05 | 广东四会互感器厂有限公司 | Far infrared nano electrothermal film heater comprising quartz glass heating tubes |
| CN205005278U (en) * | 2015-09-22 | 2016-01-27 | 齐偲含 | Quartz capsule far -infrared heating device |
| CN108610984A (en) * | 2017-02-09 | 2018-10-02 | 连云港市英普石英有限公司 | A kind of cumulative electric heating tube coating and production method |
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Application publication date: 20230613 |